Kev lag luam 2024, Kaum ib hlis
Lub zog txwv ntawm cov khoom siv - nws yog dab tsi?
Cov khoom siv hluav taws xob ntawm cov hlau lossis hlau, xws li hardness, ductility, tsis kam rau deformation, tensile zog lossis hnav tsis kam, yog cov qauv tseem ceeb rau kev xaiv cov khoom siv
Pab pawg fais fab: cov lus qhia, lub hom phiaj, cov cuab yeej thiab cov peev txheej ntsuas
Ib chav pab fais fab, lossis APU, yog chav tsev uas feem ntau siv hauv kev siv tshuab aviation. Los ntawm nws tus kheej, qhov kev teeb tsa no yog qhov tsim nyog kom tau txais cov tshuab hluav taws xob. Txawm li cas los xij, nws tsis tuaj yeem siv los txav tsheb
Locomotive depot. RZD: locomotive depot
Locomotive depot yog lub ntsiab lus uas ua haujlwm kho lossis kho cov tsheb ciav hlau. Nws tseem hu ua traction ib feem
Kev lag luam nthuav tawm thiab txhim khu kev qha twj
Kev lag luam mining yog tam sim no tsim tau zoo. Tsis tas li ntawd, qhov kev lag luam no suav nrog ntau qhov me me. Tag nrho cov kev lag luam no tau tsim muaj zog heev thiab yog lub hauv paus tseem ceeb ntawm kev tau txais ntau yam khoom siv ntuj tsim rau kev xav tau ntawm noob neej
Drawing accessories: cov cuab yeej thiab cov khoom siv
Thaum ua ntau yam ntawm cov duab nraaj, cov cuab yeej tshwj xeeb thiab cov khoom siv - kos duab accessories. Cov kws tsim qauv thiab cov kws tsim qauv siv tau cov compasses, rulers, protractors, thiab lwm yam. Cov duab kos yog tsim los ntawm cov ntawv dawb zoo heev lossis daim ntawv kos duab
Ua-nws-koj tus kheej ceramic kiln
Cov khoom siv ceramic niaj hnub no feem ntau siv hauv lub neej txhua hnub. Ceramic kilns tuaj yeem siv los ntawm cov kws ua haujlwm hauv tsev. Txawm li cas los xij, muaj ntau ntau yam, lawv muaj cov cuab yeej sib txawv thiab lwm yam ntxwv uas koj yuav tsum nkag siab ua ntej yuav los yog ua koj tus kheej
Technical carbon, nws ntau lawm
Carbon dub (GOST 7885-86) yog hom kev lag luam carbon cov khoom siv feem ntau hauv kev tsim cov roj hmab ua cov muab tub lim uas txhim kho nws cov txiaj ntsig zoo. Tsis zoo li coke thiab pitch, nws muaj yuav luag ib qho carbon, nws zoo li soot
Kev kho cua sov ntawm cov hlau yog txheej txheem tseem ceeb hauv kev tsim cov hlau
Kev kho cua sov ntawm cov hlau muab cov khoom hlau uas xav tau. Cov txheej txheem no yog ib kauj ruam tseem ceeb hauv kev tsim cov hlau alloy
Roj rau boiler tsev: nta, hom, yam ntxwv thiab yuav tsum tau
Hom roj rau boilers tuaj yeem siv sib txawv. Feem ntau cov tshuab rhaub dej ua haujlwm ntawm cov pa roj. Tab sis hluav taws xob, kua thiab roj boilers kuj nrov heev. Nyob rau hauv rooj plaub tom kawg, cov khoom siv tuaj yeem khiav ntawm cov thee, ntoo lossis pellets
Dab tsi yog tsim los ntawm cov roj? Roj refining tshuab
Dab tsi yog tsim los ntawm cov roj: nta, muaj pes tsawg leeg, hom khoom, duab. Roj refining technology: txoj kev
Kev siv cov khoom siv roj av: txoj hauv kev thiab thev naus laus zis
Refining infrastructure suav nrog kev cia khoom, twj tso kua mis thiab pom cov chaw, txhua qhov ntawm qhov sib txawv, tawm cov khib nyiab nyoos uas ua rau muaj kev puas tsuaj rau ib puag ncig. Yog li ntawd, yuav tsum tau muab pov tseg raws sij hawm ntawm cov khoom siv roj av uas tsis tuaj yeem siv hauv kev lag luam lossis kev pabcuam thauj mus los
Carbon fiber: khoom, duab, tau txais, siv
Cov lus yog hais txog carbon fiber. Kev siv thev naus laus zis ntawm kev tau txais, cov khoom ntawm cov khoom siv, nrog rau cov peev txheej thiab cov ntawv thov raug txiav txim siab
Cov tuam txhab roj thiab roj niaj hnub hauv tebchaws Russia
Kev txhim kho ntawm kev lag luam roj thiab roj yog ib qho tseem ceeb ntawm peb lub teb chaws kev lag luam. Qhov sib faib ntawm Lavxias teb sab hydrocarbon raw cov ntaub ntawv nyob rau hauv lub ntiaj teb no teev yog ntau tshaj 10%. Tau kawg, cov tuam txhab roj thiab roj Lavxias ua lub luag haujlwm tseem ceeb hauv qhov teeb meem no. Nov yog 5 lub tuam txhab loj los ntawm cov npe no
Foob pob hluav taws roj: ntau yam thiab muaj pes tsawg leeg
Gunpowder thiab nws cov analogues hauv peb lub sijhawm tsuas yog siv rau kev tsim cov qauv me me, xws li foob pob hluav taws roj. Qhov muaj pes tsawg leeg ntawm hom no tso cai rau koj tso cov foob pob hluav taws me me ob peb puas meters hauv qhov siab. Rau kev ua tub rog lub hom phiaj, foob pob hluav taws roj ntawm lwm hom feem ntau yog siv. Txawm li cas los xij, cov roj foob pob hluav taws hauv cov neeg nqa khoom niaj hnub no tsuas yog siv thaum pib
Cov hlau ruaj khov tshaj plaws: nws yog dab tsi
Rau lub sijhawm ntev, steel yog cov khoom tseem ceeb hauv kev tsim khoom thiab riam phom. Tab sis hlau tsis yog hlau. Yuav kom meej meej, nws tsis yog cov hlau ntshiab huv. Qhov no yog ib qho kev sib txuas ntawm hlau nrog carbon, uas muaj lwm yam hlau additives kuj muaj. Siv additives, steel yog alloyed, i.e. hloov nws cov khoom. Tom qab ntawd, cov hlau yog ua tiav. Steelmaking yog tag nrho kev tshawb fawb. Cov hlau muaj zog tshaj plaws yog tau los ntawm kev qhia cov alloys tsim nyog rau hauv cov hlau
Kev tsim kho ntawm "Akkuyu" - nuclear fais fab nroj tsuag hauv Turkey. Keeb kwm thiab txoj hmoo ntawm qhov project
Txhua yam hais txog Akkuyu NPP project: keeb kwm, ntsiab lus thiab cov lus piav qhia luv luv, nrog rau tus cwj pwm ntawm tib neeg rau qhov project. Vim li cas NPP qhov project tau sib tham tsis ntev los no? Yuav ua li cas rau qhov project tom qab cov xwm txheej ntawm Kaum Ib Hlis 2015? Cov lus teb hauv kab lus no
Izhevsk factories: yav dhau los, tam sim no, yav tom ntej
Izhevsk paub rau ntau tus hauv peb lub tebchaws raws li lub peev ntawm riam phom ntawm Russia. Qhov no yog qhov tseeb, tab sis ob peb tus neeg paub tias muaj ntau lub kaum os lwm lub lag luam tsom rau kev tsim khoom ntawm cov tub rog thiab cov khoom siv pej xeem. Tsab ntawv qhia txog kev lag luam Izhevsk
Tsev nkoj. Nkoj nkoj. Shipbuilding
Kev tsim Nkoj yog qhov tsim nyog rau txhua lub zog hauv hiav txwv, thiab yog li ntawd kev tsim cov nkoj yuav luag tsis nres. Txhua yam kev ua hauv hiav txwv yeej ib txwm suav tias yog kev lag luam muaj txiaj ntsig zoo, thiab qhov no yog li cas tam sim no
Stoeger X50 cua phom: tshuaj xyuas, piav qhia, specifications thiab tshuaj xyuas
Lub ntsiab lus ntawm tsab xov xwm no yog Stoeger X50 pneumatics, tsim los ntawm Italian gunsmiths thiab nthuav tawm rau pej xeem raws li kev daws teeb meem pheej yig rau kev ua si tua phom
Lub caij nyoob hoom qav taub. Lub teeb Lavxias teb sab helicopters. Lub teeb helicopters ntawm lub ntiaj teb no. Lub lightest multi-purpose helicopter
Kev sib ntaus sib tua helicopters yog tsim los thauj tib neeg, riam phom thiab siv lawv. Lawv muaj peev xwm loj, siab ceev. Tab sis lawv tsis haum rau pej xeem lub hom phiaj, lawv loj heev, kim thiab nyuaj rau kev tswj thiab khiav lag luam. Rau kev thaj yeeb nyab xeeb, koj xav tau qee yam yooj yim thiab yooj yim los tswj. Lub lightest nyoob hoom qav taub nrog lub joystick tswj yog heev haum rau qhov no
Absolute cawv. Muaj kev tsim cov cawv los ntawm cov khoom siv roj ntsha
Tsis muaj ethyl cawv tau pom nws daim ntawv thov hauv kev lag luam. Cov tshuaj no yog tsim nyog los xyuas kom meej cov tshuaj tiv thaiv ntawm cov organic synthesis. Xws li cov kua tam sim no feem ntau siv hauv chav kuaj. Thawj thawj zaug, cov kev qhia tshwj xeeb rau cov khoom no tau luam tawm xyoo 37th. Tam sim no, muaj kev tshwj xeeb GOSTs thiab cov qauv uas tswj cov kua dej zoo thiab cov nuances ntawm nws cov kev npaj
Rolled steel: hom, GOST, nqi
Tam sim no, steel dov yog ib qho ntawm cov haujlwm tseem ceeb hauv kev tsim cov rolling mills. Siv txoj kev no, koj tuaj yeem tau txais ntau yam khoom siv hlau, uas tau siv tom qab siv ntau qhov chaw ntawm tib neeg kev ua haujlwm
Dej desalination: txoj hauv kev thiab teeb tsa
Demineralization ntawm dej yog tshem tawm cov ntsev ntawm nws. Muaj ob peb txoj hauv kev uas koj tuaj yeem desalinate cov kua tag nrho lossis ib nrab. Txhua tus ntawm lawv muaj nws tus kheej zoo thiab qhov tsis zoo
Cov chaw ua haujlwm ntawm Omsk thiab Omsk cheeb tsam: keeb kwm thiab niaj hnub
Cov chaw tsim khoom ntawm Omsk thiab thaj av Omsk tuav qhov chaw tseem ceeb hauv kev lag luam Lavxias. Lub tswv yim qhov chaw nyob hauv nruab nrab ntawm lub teb chaws tso cai rau cov tuam txhab hauv zos los tsim kev lag luam koom tes nrog East thiab West. Aircraft, mechanical engineering, metallurgy, tiv thaiv thiab hluav taws xob kev lag luam yog tsim nyob rau hauv cheeb tsam
Gas sensor: piav qhia, hom, nqi
Ib chav twg uas siv cov cuab yeej siv roj yuav tsum tau kuaj xyuas cov theem ntawm cov concentration hauv huab cua ntawm cov khoom ntawm cov roj combustion. Txhawm rau ntsuas qhov ntsuas no thiab xyuas kom muaj kev nyab xeeb hauv lub neej txhua hnub thiab hauv kev lag luam, ib qho cuab yeej tshwj xeeb yog siv - lub ntsuas roj. Cov cuab yeej zoo li cas nws yog, thiab nws ua haujlwm li cas, tau tshaj tawm hauv kab lus
Dab tsi yog qhov zoo tshaj plaws spindle rau CNC?
Lub spindle tuaj yeem muaj ib qho qauv tsim nrog cov khoom siv tam sim no thiab ib qho sib cais. Lub kinematic kev twb kev txuas rau tom kawg yog nqa tawm los ntawm txoj siv txoj siv sia los yog gearbox, thiab lub gearbox nrog phau ntawv thiab tsis siv neeg ua haujlwm kuj tseem siv tau
Asmeskas kev lag luam tsheb: keeb kwm, kev loj hlob, lub xeev tam sim no. US automotive kev lag luam
Yuav ua li cas Asmeskas kev lag luam automaker tau hloov zuj zus. Yuav ua li cas cov txheej txheem ntawm modernization tau suav hais tias yog revolutionary thaum pib ntawm lub xyoo pua xeem. Tsim qhov loj peb pib txhawj xeeb. Kev tsim kho niaj hnub ntawm Asmeskas tsheb lag luam
Tung roj: ntau lawm, daim ntawv thov, khoom, tshuaj xyuas
Tung roj tau ntev tau siv los ua cov khoom siv ntoo. Rau ntau centuries, nws tau tsim nws tus kheej raws li ib tug zoo heev preservative, antiseptic, nrog zoo nkauj zoo nkauj
Tso cov kab hauv qhov trench: tso siab rau kev ua haujlwm rau cov kws tshaj lij
Tsuas yog cov tuam txhab tshwj xeeb thiab cov koom haum uas muaj tag nrho cov ntawv tso cai thiab tso cai ua cov haujlwm zoo li no muaj cai tso 10 kV cable. Kev teeb tsa ntawm cov kab hluav taws xob hais txog yog ib qho kev ua haujlwm hnyav thiab lub luag haujlwm. Kev ua haujlwm ntawm kev tso cov cable zoo li no yuav xav tau cov khoom siv txaus, cov cuab yeej thiab cov khoom siv
Tub rog riam phom: fighter dav hlau
Fighter yog ib lub dav hlau tub rog, lub hom phiaj tseem ceeb ntawm kev rhuav tshem cov yeeb ncuab cua. Lawv yog siv los ua tus escort rau huab cua tsheb, tiv thaiv cov chaw hauv av los ntawm cov yeeb ncuab dav hlau. Tsis tshua muaj, cov dav hlau tua rog tawm tsam hiav txwv thiab hauv av lub hom phiaj
Engineering systems - installation, nta thiab yuav tsum tau
Cov kab lus no tau mob siab rau rau kev teeb tsa ntawm engineering systems. Nws cov yam ntxwv, kev xav tau, kev tsim thiab kev siv tshuab dav dav suav nrog
Pipeline tso: txoj hauv kev thiab thev naus laus zis
Piping tuaj yeem ua tiav siv ntau yam txuj ci. Feem ntau, txoj kev loj yog rub nrog trenches khawb ua ntej. Tsis tas li ntawd, kev sib dhos tuaj yeem ua tau los ntawm txoj kev qhib hauv av lossis hauv cov channel. Qee lub sij hawm txoj kev loj yog nteg siv txoj kev trenchless: los ntawm kev xuas nrig ntaus los yog xuas nrig ntaus cov av
Lub tsheb ciav hlau yog kev thauj mus los rau pej xeem. Cov ntaub ntawv qhia txog hluav taws xob tsheb ciav hlau
Cov kab lus muab cov ntaub ntawv yooj yim txog cov tsheb ciav hlau hauv nroog: lawv yog dab tsi, lawv txawv li cas ntawm cov tsheb ciav hlau nyob deb, lawv ua haujlwm li cas thiab lawv xav tau rau leej twg
Kev tsim tawm ntawm cov cuab tam ruaj khov ntawm kev lag luam
Tus txheej txheem ntawm kev tsim cov cuab tam ruaj khov li cas? Cov peev txheej twg ntawm nws qhov kev siv yog siv?
Main pipeline gas pipeline
Hnub no nyuaj rau xav txog lub ntiaj teb thiab ib tus kheej lub neej yam tsis muaj kev ua tiav ntawm kev tshawb fawb thiab thev naus laus zis. Ntau tus neeg xav tias qhov kev ua tiav tseem ceeb yog kev txhim kho cov ntaub ntawv, tab sis tsuas yog xav txog koj lub neej yam tsis muaj chaw tsim khoom! Hauv lub neej txhua hnub, txhua tus neeg siv cov txiaj ntsig ntawm kev vam meej: dej, hluav taws xob, roj, cua sov, thiab tsis tuaj yeem xav txog lawv lub neej zoo yam tsis muaj lawv. Txhawm rau xa cov dej thiab roj av, cov kav dej thiab cov pa roj tau tsim, uas ua raws li lub tsheb
Nkoj me. Muaj cai ua cov nkoj me me
Nkoj me: piav qhia, pawg, nta, kev ua haujlwm, kev saib xyuas. Cov nkoj me me: txoj cai tswj hwm, dej num, duab
Russian tsheb: hom, npe
Nws yuav zoo rau koj paub tias qee lub npe tsheb Lavxias tau nrov heev hauv lwm lub tebchaws. Tshwj xeeb, qhov no yog Niva thiab nto moo UAZ. Tsheb tau txais kev muaj koob meej vim lawv muaj peev xwm hla teb chaws ntau ntxiv. Thiab txawm hais tias muaj ntau yam kev xaiv zoo dua, ntau tus neeg txawv teb chaws nyiam siv Lavxias Niva rau kev yos hav zoov, nuv ntses thiab lwm yam kev lom zem uas yuav tsum tau mus los ntawm qhov chaw tsis tuaj yeem
Banner npuag - dab tsi los xav txog thaum xaiv?
Kev lag luam tsis xav txog yam tsis muaj kev tshaj tawm. Kev xaiv ntawm kev tshaj tawm rau peb lub tuam txhab PR phiaj xwm yog nyob ntawm ntau yam. Ua ntej ntawm tag nrho cov, los ntawm ib tug uas yuav yog tus neeg sawv cev ntawm lub tswv yim - cov tuam txhab los yog cov neeg. Feem ntau, cov ntaub ntawv xws li banner npuag, mesh, ntawv yog xaiv rau kev tshaj tawm sab nraum zoov. Tus so yog qhov teeb meem ntawm cov txheej txheem. Nyob rau hauv lub teeb los yog ntawm cov ntawv tshaj tawm, ntau yam ntaub ntawv tuaj yeem kho. Banner ntaub feem ntau yog siv rau streamers - ob qho tib si sab nraum zoov thiab sab hauv tsev
Ultrasonic ua: thev naus laus zis, qhov zoo thiab qhov tsis zoo
Kev lag luam hlau ua haujlwm nyob rau theem ntawm kev txhim kho no muaj peev xwm daws cov haujlwm nyuaj ntawm kev txiav thiab drilling workpieces ntawm ntau qib ntawm hardness. Qhov no tau dhau los ua tau vim yog kev txhim kho ntawm cov txheej txheem tshiab ntawm kev cuam tshuam cov khoom siv, suav nrog ntau pawg ntawm cov txheej txheem electromechanical. Ib qho ntawm cov thev naus laus zis zoo tshaj plaws ntawm hom no yog kev kho ultrasonic (UZO), raws li cov qauv ntawm electroacoustic hluav taws xob
"Sakhalin-1". Roj thiab roj qhov project ntawm Sakhalin Island
Txoj haujlwm Sakhalin-1 yog lub koom haum thoob ntiaj teb rau kev rho tawm cov roj zoo Sokol thiab cov nkev zoo ntawm cov txee sab av loj tawm sab qaum teb sab hnub tuaj ntawm Sakhalin Island
Cov khoom siv hauv tsev welding: kos duab
Vuam txoj haujlwm qee zaum koom nrog kev siv zog tsawg dua thiab sijhawm piv rau kev npaj rau lawv. Lawv cov ntsiab lus tseem ceeb yog kev sib sau ua ke ntawm cov qauv welded, thaum lub sijhawm nws yog qhov tsim nyog los kho cov ntsiab lus hauv txoj haujlwm xav tau. Txoj haujlwm no yuav tsum tau saib xyuas los ntawm tus tswv, vim tias cov khoom zoo nyob ntawm nws
HPP yog Shushenskaya HPP
HPP yog ib yam khoom tsim los ntawm tus dej txhawm rau hloov lub zog ntawm nws cov dej ntws mus rau hauv hluav taws xob. Ib qho ntawm cov qauv tseem ceeb ntawm hydroelectric fais fab nroj tsuag feem ntau yog lub pas dej ua ke uas thaiv cov channel
Cov ntsiab cai tseem ceeb ntawm TPP kev ua haujlwm
Tam sim no, tib neeg tab tom siv hluav taws xob. Nws yog lub zog siv rau feem ntau cov khoom siv thiab khoom siv. Yuav kom nkag siab qhov twg nws los ntawm, nws yog ib qho tsim nyog yuav tsum nkag siab txog cov hauv paus ntsiab lus ntawm kev ua haujlwm ntawm thermal fais fab nroj tsuag, vim lawv yog cov feem ntau
Kev txwv qhov system: lub hom phiaj, kev ua haujlwm thiab kev xav tau
Kev txwv tsis pub muaj lub luag haujlwm tseem ceeb heev. Nws yog nws uas kho tus neeg ntawm qhov siab, nrog rau hauv tsheb. Nyob rau hauv nws cov hauj lwm, muaj ib tug xov tooj ntawm subtleties uas yuav tsum tau coj mus rau hauv tus account thiaj li yuav ua tau zoo
Pob zeb tov khoom - kev ntsuas qhov zoo tshaj plaws, cov yam ntxwv thiab cov ntsiab lus ntawm cov qauv
Raws li ib feem ntawm kev tsim khoom lag luam lossis kev kho vaj tsev loj, xav tau ib lub pob zeb sib tov. Tus nqi ntawm cov pob zeb uas tau tsim nrog cov cuab yeej no yog ob peb zaug ntau dua li qhov ntim ntawm mortar ua los ntawm tes. Peb muab cov ntsiab lus ntawm qee cov qauv ntawm cov pob zeb sib tov uas yog, raws li kev ntsuas, hauv cov npe ntawm qhov zoo tshaj plaws
Lysvensky Metallurgical Cog Kaw Lub Tuam Txhab Sib Koom Tes: keeb kwm, piav qhia, cov khoom lag luam
CJSC Lysva Metallurgical Cog yog ib qho ntawm cov lag luam Ural. Nws yog ib qho chaw loj rau kev tsim cov galvanized polymerized ntawv hlau thiab cov khoom los ntawm nws. Ntau lub cev ntawm cov tsheb hauv tsev yog ua los ntawm Lysvensky dov cov khoom
Recorder mount: tshuaj xyuas cov qauv, duab nrog piav qhia
Lub tshuab tswj tsheb uas ua rau kev tsav tsheb yooj yim dua thiab xis nyob yog qhov xav tau ntawm cov tswv tsheb. Cov cuab yeej no raws li yuav tsum tau ua tiav ntawm ntau yam khoom siv
Lub tshuab ntim khoom: txheej txheem cej luam ntawm cov qauv, lub hauv paus ntsiab lus ntawm kev ua haujlwm, duab
Txhua qhov kev tsim ua tiav niaj hnub no xav tau cov khoom ntim khoom. Xws li cov tshuab thiab cov txheej txheem tso cai rau kev ntim khoom tsis siv neeg lossis phau ntawv ntawm ntau yam khoom. Lawv muaj peev xwm ua tau ntau yam kev ua haujlwm tau zoo thiab nrawm thiab yog cov pab cuam txhim khu kev qha hauv kev tsim khoom. Cov tshuab ntim khoom thiab cov khoom siv tuaj yeem yog ib feem ntawm cov kab ntau lawm lossis ua haujlwm autonomously
Tsheb thauj mus los: kev faib thiab hom, piav qhia, yam ntxwv
Hnub no, cov tsheb thauj khoom hauv qab no tau siv hauv kev tsim kho: av, huab cua, hiav txwv. Feem ntau, nws yog cov khoom siv hauv av uas siv. Kwv yees li ntawm 90% ntawm tag nrho cov tsheb thauj mus los yog siv los ntawm kev thauj mus los. Ntawm cov tsheb hauv av, tsheb, tsheb laij teb thiab kev tsheb ciav hlau thauj mus los tau nquag siv
Txiav nrawm rau milling, tig thiab lwm hom kev ua haujlwm ntawm cov khoom
Kev suav ntawm kev txiav yog qhov tseem ceeb tshaj plaws hauv kev tsim khoom ntawm txhua qhov chaw. Nws yog ib qho tseem ceeb heev uas cov xam nws tus kheej yog rational. Qhov no yog vim lub fact tias rau ntau yam mechanical kev khiav hauj lwm nws yog tsim nyog los xaiv tus kheej lub txiav ceev, spindle ceev, pub tus nqi, thiab qhov tob ntawm txiav. Ib hom kev xav yog ib qho uas cov nqi tsim khoom yuav tsawg tsawg, thiab qhov ua tau zoo ntawm cov khoom yuav raug raws li qhov ua tau
Machining ntawm hlau: hom thiab txoj kev
Machining yog ib txheej txheem thaum lub sij hawm qhov ntev thiab configuration ntawm workpieces thiab qhov chaw hloov. Yog tias peb tham txog cov khoom siv hlau, ces cov cuab yeej txiav tshwj xeeb yog siv rau lawv cov kev ua, xws li cutters, broaches, xyaum, kais, cutters, thiab lwm yam. Tag nrho cov kev khiav hauj lwm yog ua los ntawm cov hlau-txiav tshuab raws li daim ntawv qhia technologies. Hauv tsab xov xwm no, peb yuav kawm txog dab tsi yog cov txheej txheem thiab hom kev ua haujlwm ntawm cov hlau
Milling yog Milling fixture thiab txheej txheem piav qhia
Milling yog txoj kev kho saum npoo raws li kev ua haujlwm sib txawv ntawm cov hniav ntawm lub tshuab txiav. Muaj ntau ntau yam cuab yeej nyob ntawm lawv lub hom phiaj kev ua haujlwm, cov ntaub ntawv ua tiav, cov yam ntxwv ntawm cov khoom tsim
Txiav hom thaum lub sij hawm milling: xam, txhais, qauv
Yuav ua li cas txiav txim siab txiav hom thaum milling? Rau qhov no, muaj cov qauv, thiab cov ntxhuav, thiab cov duab
Agricultural machinery yog ib qho kev lag luam tseem ceeb
Kev ua liaj ua teb kev ua liaj ua teb ua lub luag haujlwm tseem ceeb hauv kev ua kom lub teb chaws muaj kev ruaj ntseg zaub mov, yog li cov kws tshaj lij tau sau nrog kev txaus siab tias nyob rau xyoo tas los no muaj qee qhov kev loj hlob hauv kev lag luam Lavxias no. Qee lub tuam txhab tau xaiv "Belarusian txoj kev", muab cov cuab yeej siv yooj yim nrog "ib puag ncig tus phooj ywg" xyaw, siv qhov yuav tsum tau ua, piv txwv li, hauv Tebchaws Europe
Lub raj dej boiler: khoom siv, lub hauv paus ntsiab lus ntawm kev lag luam hauv kev lag luam
Chav generators feem ntau yog siv rau kev ua haujlwm thev naus laus zis - piv txwv li, los tsim cov dej los ntawm evaporating. Tab sis qhov ua tau ntawm kev ua haujlwm hauv tsev tsis suav nrog, yog tias tsim nyog los npaj cov dej kub rau ntau tus neeg siv khoom loj. Ntawm qhov zoo tshaj plaws lub tshuab hluav taws xob tsim hluav taws xob tsim hluav taws xob, ib tus tuaj yeem nco ntsoov cov dej-tube tsim. Lub boiler ntawm hom no tsis yog qhov qis dua rau ntau cov analogues ntawm cov zis hauv ib chav tsev ntawm lub sijhawm, tab sis nws cov qauv tsim ua rau muaj kev txwv rau kev ua haujlwm hauv cov xwm txheej nruj
Tswb thiab hluav taws tua hluav taws installation
Zaj lus no mob siab rau lub tswb hluav taws thiab tua hluav taws. Cov thev naus laus zis rau kev txhim kho cov khoom tseem ceeb ntawm cov tshuab no suav nrog
Weaving: txheej txheem piav qhia, nta, thev naus laus zis
Kev lag luam textile raug nyob hauv ib qho chaw tshwj xeeb hauv kev lag luam hauv lub tebchaws, muab cov neeg siv khoom ntawm ntau qib nrog ib qho ntawm cov khoom siv ntau tshaj plaws hauv ntu kev lag luam. Raws li kev coj ua ntawm cov neeg koom nrog hauv kev ua lag luam no, peb tuaj yeem tham txog kev tsim cov ntaub, knitwear, ntaub pua plag, thiab lwm yam. Raws li nws tsim, weaving tau dhau los ua nyuaj thiab ntxiv nrog cov haujlwm tshiab thiab muaj peev xwm
Fais fab transformer TMG 1000 kVA
TMG 1000 kVA fais fab hloov pauv yog tsim los txo qhov hluav taws xob hauv peb-theem hluav taws xob network. Qhov no yog ob-winding transformer uas hloov hluav taws xob hluav taws xob los ntawm high-voltage hluav taws xob tes hauj lwm nrog ib tug voltage ntawm 6-35 kV mus rau ib tug tsawg-voltage voltage mus txog ib tug qauv ntawm 0.4 kV
Grover washer - ib qho yooj yim daws rau ib qho teeb meem nyuaj
Washers yog hu ua fasteners ua los ntawm ntau yam ntaub ntawv, feem ntau yog hlau los yog yas. Lawv cov duab feem ntau yog annular, tab sis nws kuj tuaj yeem sib txawv (square, rectangular thiab txawm polygonal). Lawv tau tsim los faib cov khoom thauj thaum tsav tsheb ceev, screws, screws, bolts, studs thiab lwm yam threaded ntsiab, tiv thaiv dents thiab lwm yam kev puas tsuaj, thiab kom ntseeg tau tias hluav taws xob zoo. Tab sis kuj muaj ib qho txawv txawv puck
Jute ntaub: piav qhia nrog duab, qauv, ntaub muaj pes tsawg leeg thiab daim ntawv thov
Jute ntaub yog dav siv los ua ntau yam khoom. Feem ntau, cov khoom siv no, ntawm chav kawm, yog siv los xaws lub hnab ntim khoom. Tab sis jute kuj tuaj yeem ua tau, piv txwv li, lim dej, ntau yam khoom siv tes ua, cov ntxaij vab tshaus, thiab lwm yam
Nyiaj pub dawb yog dab tsi thiab yuav suav li cas?
Ua ntej koj tau txais qhov ua tiav, ntau yam kev ua haujlwm sib txawv ua tiav nrog cov khoom ua haujlwm. Ib qho tseem ceeb tshaj plaws yog lub ntsiab lus ntawm cov nyiaj ua haujlwm machining. Nws qhov loj me yog qhov sib txawv ntawm qhov loj ntawm lub workpiece thiab qhov loj ntawm qhov raws li daim duab kos
Nqaij thiab pob txha noj mov: cov lus qhia rau kev siv
Nqaij thiab pob txha noj yog cov khoom siv los ua zaub mov ntxiv rau kev pub qaib, npua, nyuj, nyuj me, thiab lwm yam. pub
Aluminium alloys: cov khoom thiab ua cov hlau
Aluminium alloys feem ntau siv hauv kev tsim kho, kev lag luam thiab lwm yam kev lag luam. Txawm li cas los xij, ua ntej siv lawv, nws yog qhov yuav tsum tau kawm txog cov khoom ntawm cov alloys, nrog rau cov yam ntxwv ntawm lawv cov txheej txheem
Ultrasonic kuaj ntawm cov pob qij txha welded, txoj kev thiab thev naus laus zis ntawm kev sim
Ultrasonic kuaj - cov cuab yeej siv siab tshaj plaws rau kev kawm ntawm vuam pob qij txha thiab cov seams. Nws yuav tau tham hauv kab lus no
Cov khob noom cookie kneading tshuab. Txheej txheem cej luam ntawm cov qauv zoo tshaj plaws
Cov tshuab ua khob noom niaj hnub tuaj yeem muaj lub zog sib txawv, tsim thiab ua haujlwm. Thaum xaiv cov khoom siv rau lub tsev noj mov lossis khoom noj khoom haus, peb qhov tsis zoo yuav tsum raug coj mus rau hauv tus account thawj qhov chaw. Nyob rau hauv kev ua lag luam muaj cov chav tsev tsim rau kev tsim khoom ntawm ob qho tib si hnyav thiab lub teeb khob noom cookie
Cov nqaij hauv kaus poom: GOST, TU thiab kos npe
Cov nqaij hauv kaus poom thiab ntses muaj lub neej ntev. Lawv cov zaub mov muaj nqis heev. Cov khoom no yooj yim rau kev thauj mus los. Muaj cov chaw tsim khoom tshwj xeeb hauv lub tebchaws uas tsim lawv rau ntau tus neeg siv khoom
Tooj liab ore: mining, refining, deposits thiab nthuav tseeb
Tooj liab yog siv dav hauv yuav luag txhua qhov kev lag luam uas twb muaj lawm, nws sawv tawm los ntawm ntau yam ores vim nws yog qhov xav tau tshaj plaws. tooj liab ore yog ib qho khoom siv ntuj tsim los ntawm cov ore hu ua bornite uas feem ntau siv hauv kev lag luam. Qhov kev thov zoo rau cov ore no tshwm sim tsis tau tsuas yog vim qhov loj ntawm tooj liab nyob rau hauv muaj pes tsawg leeg, tab sis kuj yog vim qhov zoo reserves ntawm bornite nyob rau hauv av
Kev tsim kho ntawm Nizhne-Bureiskaya HPP, Amur Cheeb Tsam
Raws li cov phiaj xwm, kev tsim kho ntawm Nizhne-Bureiskaya HPP yuav tsum ua kom tiav thaum kawg ntawm 2016. Qhov kev tso tawm ntawm cov chaw nres tsheb yuav ua haujlwm rau kev txhim kho hauv cheeb tsam, txuag cov peev txheej thiab ua rau cov txheej txheem nyuaj
Hom ntoo zoo tshaj plaws: piav qhia, hom thiab daim ntawv thov
Nyob ntev, cov ntoo muaj txiaj ntsig tau siv los ntawm tib neeg los tsim vaj tsev thiab nkoj, tsim cov rooj tog thiab khoom siv hauv tsev. Vim li cas ho tsis? Tom qab tag nrho, cov khoom yog txawv los ntawm nws txoj kev ntseeg siab, kev zoo nkauj thiab ntuj sov sov. Yog li ntawd, nws tsis yog qhov xav tsis thoob tias nyob rau hauv cov xwm txheej ntawm kev tsim khoom niaj hnub no, cov ntoo ntawm cov tsiaj muaj txiaj ntsig, tau piav qhia hauv qab no, tau siv los ua ntau yam khoom
Russian nuclear fais fab nroj tsuag
Lub ntsiab lus pib ntawm keeb kwm ntawm kev paub lub zog kawg tuaj yeem suav tias yog xyoo 1939, thaum pom uranium fission. Nws yog thaum ntawd I. V. Kurchatov tau lees paub qhov xav tau rau kev tshawb fawb ua haujlwm ntsig txog atomic zog. Xya xyoo tom qab, thawj nuclear reactor tau tsim thiab launched nyob rau hauv Russia
Kev cog qoob loo: piav qhia, nta
Cov chaw ua haujlwm yog lub tuam txhab mining rau kev ua thawj zaug ntawm cov khoom ntxhia. Lub hom phiaj ntawm cov txheej txheem ntawm cov mining thiab kev cog qoob loo yog kom tau txais cov khoom muaj txiaj ntsig zoo. Cov khoom tshwm sim yog xav tau rau kev siv hauv kev lag luam
Stern ntawm lub nkoj, cabins ntawm tus thawj coj thiab nws pab, daim ntawv qhia thiab cov cuab yeej
Lub stern ntawm lub nkoj sailing nyob rau hauv lub 18th-19th centuries tau txawv los ntawm kev nplua nuj kho kom zoo nkauj, sab nrauv kho kom zoo nkauj ua los ntawm cov ntoo zoo nkauj, ntau balustrades thiab carved cornices. Lub sab hauv ntawm lub after quarters kuj dhuav cov cim ntawm cov khoom kim heev, cov plag tsev tau ntaub pua plag, cov phab ntsa thiab qab nthab tau sheathed nrog polished mahogany panels. Lub stern ntawm lub nkoj yog nws qhov tseem ceeb ntawm txhua yam
German kev lag luam. Nws nto moo rau dab tsi?
Lub teb chaws Yelemees yog ib lub xeev thawj coj ntawm European Union. Nws cheeb tsam yog 357 txhiab square meters. km, thiab cov pejxeem muaj txog 83 lab tus tib neeg. Kev lag luam German yog suav tias yog ib qho ntawm cov muaj zog tshaj plaws tsis yog hauv thaj av xwb, tab sis kuj nyob hauv ntiaj teb. Nws txoj kev loj hlob tuaj yeem muab faib ua ob lub sijhawm tseem ceeb: ua ntej tsov rog thiab tom qab tsov rog (World War II)
Lub Northern Fleet yog Russia lub polar shield
Pib los ntawm tsib caug xyoo, Northern Marine Fleet tau dhau los ua dej hiav txwv, nuclear thiab missile nkoj. Lub ntiaj teb thawj lub nkoj-based ballistic tso tawm tau tsim nyob rau xyoo 1956 hauv Hiav Txwv Dawb
Lub nkoj loj tshaj plaws hauv tebchaws Russia
Kev lag luam nkoj tsim khoom hauv tsev tau pib los ntawm Peter the Great. Nws yog tus huab tais no uas, thaum kawg ntawm lub xyoo pua 17th, nrhiav tau lub Arkhangelsk State Shipyard, uas tom qab ntawd tsim lub caj qaum ntawm thawj Lavxias teb sab tub rog flotilla. Nyob rau hauv peb tsab xov xwm koj yuav pom cov ntaub ntawv hais txog cov loj tshaj plaws shipbuilding nroj tsuag nyob rau hauv Russia nyob rau hauv lub sij hawm tam sim no, nrhiav seb dab tsi thiab nyob rau hauv dab tsi ntim lawv tsim
Kev nyab xeeb tawg valve: lub hom phiaj, kev teeb tsa
Cov khoom siv boiler, txawm tias nws yog boiler hauv ib lub tsev ntiag tug lossis chav boiler loj hauv kev lag luam, yog qhov txaus ntshai. Lub tsho dej boiler nyob rau hauv lub siab tas li yog qhov ua rau tawg. Txhawm rau kom muaj kev nyab xeeb, boilers thiab lwm yam khoom siv hluav taws xob uas tsim los niaj hnub no tau nruab nrog ntau lub tshuab tiv thaiv thiab khoom siv. Ib qho yooj yim thiab pheej yig tshaj plaws - ib qho kev nyab xeeb valve ntsia rau hauv cov cua sov
"Boeing 737-400": sab hauv layout
Nyob hauv ntiaj teb cov neeg caij dav hlau dav hlau, Boeing 737-400 tau ua thiab tseem yog lub dav hlau nrov tshaj plaws rau ntau xyoo. Tag nrho cov keeb kwm ntawm cov neeg nrog caij dav hlau kev lag luam tsis paub lwm yam aircraft qauv nyob rau hauv cov nqe lus ntawm tus naj npawb ntawm aircraft tsim. Tsev neeg Boeing 737-400 twb muaj peb tiam ntawm lub dav hlau. Raws li cov lus pom zoo ntawm charter carriers, tus qauv tau hloov me ntsis
Tus qauv ntawm lub tshuab tsom
Tus qauv ntawm lub tshuab tsom, nws tsim ncaj qha nyob ntawm lub hom phiaj ntawm cov cuab yeej no. Rau kev tshawb fawb tshawb fawb, X-ray thiab cov khoom siv hluav taws xob kho qhov muag yog siv, uas muaj cov cuab yeej siv ntau dua li cov khoom siv teeb
Txoj kev cov menyuam - hom thiab lub hom phiaj
Kev cia siab, ua haujlwm ntev thiab lub zog ntawm txoj kev mus rau qhov loj nyob ntawm kev tsim kho ntawm txoj kev zoo. Txhawm rau pab txhawb txoj haujlwm no, siv cov txheej txheem tshwj xeeb
Metalworking tshuab dhos
Cov kab lus no mob siab rau kev ua haujlwm hlau tshuab dhos. Cov yam ntxwv ntawm cov khoom siv, hom, manufacturers, thiab lwm yam yog xam
HPP Boguchanskaya: kev tsim kho, xov tooj, duab, thaj tsam dej nyab
Thaum kawg ntawm Lub Rau Hli 2016 hauv Russia, Boguchanskaya HPP tshiab, ua rau ntawm Angara River, 444 km ntawm nws lub qhov ncauj, hauv thaj tsam taiga hav zoov, mus txog nws lub peev xwm tsim tag nrho. Nyob rau hauv cov nqe lus ntawm lub hwj chim, qhov chaw nres tsheb no yog 5th nyob rau hauv lub teb chaws, thiab nyob rau hauv cov nqe lus ntawm equipping nrog niaj hnub khoom, nws nyob rau hauv lub thib ib
Far Eastern Railway: keeb kwm thiab yam ntxwv
Lub Far Eastern Railway yog txoj kab tseem ceeb txuas rau nruab nrab ntawm Russia nrog ntug dej hiav txwv Pacific. Ib me ntsis txog keeb kwm ntawm Far Eastern Railway thiab nws txoj haujlwm tam sim no
Crawler roj av snow blower: tshuaj xyuas, specifications thiab tshuaj xyuas
Cov kab lus yog hais txog kab ntsig roj av daus tshuab. Cov yam ntxwv, kev tshuaj xyuas thiab nuances ntawm kev xaiv cov khoom siv no suav nrog
Acrylic - ntaub los ntawm txhua yam tuaj yeem sewn
Koj puas xav tau cov khoom siv ruaj khov thiab zoo nkauj? Ua tib zoo mloog rau acrylic. Cov ntaub zoo kawg nkaus zam kev ntxuav tsis tu ncua, raws li cov cai ntawm kev saib xyuas tsis poob nws cov duab qub thiab xim. Txog niaj hnub no, acrylic yog siv rau kev tsim cov khaub ncaws, textiles thiab ntau lwm yam khoom
Nylon yog cov khoom tshwj xeeb, tsis yog hloov rau cov ntaub ntuj
Nylon nylon yog cov ntaub siv high-tech, qee zaum muaj peev xwm ntawm ib sab ntawm cov dej molecules, resistant (tsis zoo li cov analogues ntawm 40-60s) rau ultraviolet hluav taws xob thiab cua sov
Lub teeb trams. High-speed tram nyob rau hauv Moscow
Lub teeb trams yog hom kev thauj khoom tshiab, yooj yim, txhim khu kev qha thiab kev lag luam tib lub sijhawm. Lawv txav mus raws ib txoj kab tshwj xeeb, thiab yog li ntawd lawv tsis ntshai ntawm cov tsheb thauj mus los. Qhov tseeb, cov no yog cov tsheb ciav hlau thauj neeg caij tsheb ntawm qhov ceev ntawm tsawg kawg 24 km / h
Polymers hauv peb lub neej niaj hnub: roj hmab hluavtaws
Synthetic rubber plays lub luag haujlwm tseem ceeb hauv tib neeg lub neej. Nws muaj nyob rau hauv yuav luag tag nrho cov sectors ntawm peb lub neej: los ntawm cov tais diav, cov khoom ua si mus rau lub automotive kev lag luam thiab foob pob ua ntxaij. Muaj ob pawg tseem ceeb: cov roj hmab tshwj xeeb thiab cov hom phiaj dav dav. Thiab txhua pawg no muaj nws tus kheej siv tshwj xeeb
Industrial kav: hom, yam ntxwv, lub hom phiaj
Cov yeeb nkab kev lag luam yog ib feem tubular lossis lub tog raj kheej hollow, tab sis tsis tas yuav hloov. Nws yog siv ntau zaus rau kev thauj khoom, kua, roj, kev ncua, hmoov thiab cov khoom me me. Ntau hom kav dej siv hauv kev lag luam, lawv txawv tsis yog hauv txoj kab uas hla thiab cov khoom siv, tab sis kuj nyob rau hauv txoj kev ntawm installation. Lawv qhov kev faib tawm yog qhov dav, tab sis kom nkag siab nws, koj yuav tsum kawm txog cov kav dej siv hauv ntau yam lag luam
Coke cub - metallurgical unit for make coke: device
Kev taw qhia txog cov qhov cub coke rau hauv kev ua haujlwm tau pib hauv 50s ntawm lub xyoo pua xeem. Qhov muaj txiaj ntsig ntim ntawm thawj qhov cub tawg yog 21.6 Nm³. Ntxiv rau hauv tsab xov xwm peb yuav xav txog cov cuab yeej ntawm lub npe khoom siv
Float level gauges: piav qhia, hom, txoj cai ntawm kev ua haujlwm thiab tshuaj xyuas
Cov kab lus yog mob siab rau cov ntsuas qib ntab. Cov hom khoom siv, lub hauv paus ntsiab lus ntawm kev ua haujlwm, kev tshuaj xyuas cov neeg siv, thiab lwm yam yog txiav txim siab
Borehole qib ntsuas: qauv thiab cov chaw tsim khoom
Cov ntsuas ntsuas qhov ntsuas dej tau muab rau hauv Lavxias niaj hnub no los ntawm ntau lub tuam txhab, ob leeg hauv tsev thiab txawv teb chaws. Yog tias tsim nyog, hnub no koj tuaj yeem yuav ob qho tib si hluav taws xob thiab hydrostatic lossis radar ntaus ntawv ntawm hom no
Lub tshuab ntawm lub nkoj. Kev npaj ntawm tsev hais plaub thiab lawv cov ntsiab lus tseem ceeb
Kev tsim lub nkoj yog lub luag haujlwm rau cov neeg ua haujlwm ntawm tub rog. Lawv yuav tsum ua kom tag nrho cov khoom thauj thiab cov neeg caij tsheb khiav. Txhua txoj haujlwm tuaj yeem daws tau zoo tsuas yog nrog kev pab los ntawm kev txhim kho zoo ntawm lub nkoj
Hydrodistributor R-80: daim duab, ntaus ntawv, kev sib txuas, ua-nws-koj tus kheej kho
P-80 hydraulic distributor yog siv rau cov tsheb laij teb tsim los ntawm MTZ, tsim los rov faib cov dej ntws ntawm cov koog no. Qhov sib tov ntws los ntawm lub twj tso kua mis mus rau qhov chaw ua haujlwm ntawm lub tog raj kheej. Kev tsim cov cuab yeej ua rau nws tuaj yeem kho cov roj siab hauv lub cev, txhim kho cov ntawv txuas hauv qhov xav tau
Dab tsi tshiab metro chaw nres tsheb tau qhib hauv Moscow. Scheme ntawm tshiab Moscow metro chaw nres tsheb
Moscow Metro tau nthuav dav dhau ntawm txoj kev Moscow Ring Road. Muaj cov tsheb ntawm kev tswj tsis siv neeg, cov tswv yim ntawm cov chaw nres tsheb hauv Moscow tshiab tau hloov kho tas li
Amur Gas Processing Plant (Amur Gas Processing Plant) - qhov chaw tsim kho loj tshaj plaws hauv tebchaws Russia
Amur GPP hauv 2017 yog qhov kev tsim kho loj tshaj plaws hauv tebchaws Russia. Tom qab commissioning, lub lag luam no yuav muab cov lag luam nrog 60 lab cubic meters ntawm helium ib leeg. Ntawm lwm yam, cov nroj tsuag no yog ib qho tseem ceeb ntawm qhov project grandiose "Power ntawm Siberia"
Anti-kev sib txhuam cov ntaub ntawv: txheej txheem cej luam, khoom, daim ntawv thov
Cov kab lus no mob siab rau cov ntaub ntawv tiv thaiv kev sib txhuam. Lawv cov khoom, nta, ntau yam, nrog rau cov cheeb tsam ntawm daim ntawv thov raug txiav txim siab
United tuam txhab RUSAL: qauv, kev coj noj coj ua, cov khoom
RUSAL Corporation yog ib qho ntawm cov neeg pom zoo tshaj plaws hauv kev lag luam Lavxias. Dab tsi yog cov yam ntxwv tseem ceeb ntawm nws cov khoom? RUSAL txoj kev lag luam ua haujlwm li cas?
Kev siv platinum. Qhov twg thiab siv platinum li cas?
Kev siv platinum hauv kev lag luam niaj hnub no yeej tsim nyog. Tsis tsuas yog cov hniav nyiaj hniav kub kim yog tsim los ntawm cov hlau no, tab sis kuj tseem muaj cov cuab yeej kho mob tshwj xeeb, fiberglass, cov khoom siv hauv chav kuaj
Hadfield steel yam ntxwv: muaj pes tsawg leeg, daim ntawv thov
Kev lag luam metallurgical yog ib qho tseem ceeb tshaj plaws ntawm GDP ntawm txhua lub teb chaws, thiab nws kuj tsim cov khoom tshwj xeeb thiab muaj txiaj ntsig. Tib neeg tsis tuaj yeem ua yam tsis muaj cov khoom tsim los ntawm cov nroj tsuag metallurgical. Steel yog ib tug ntawm lawv. Muaj ntau hom khoom siv no, uas yog siv hauv ntau lub lag luam. Cov hlau uas muaj qhov hnyav thiab hnav tus nqi, tseem hu ua Hadfield steel, yog ib qho tshwj xeeb alloy
Hom vuam thiab lawv cov yam ntxwv
Zaj lus hais txog hom kev vuam muaj dab tsi, lawv txawv li cas. Dab tsi yog qhov tshwj xeeb ntawm cov txheej txheem no feem ntau? Cov kev faib tawm yog dab tsi?