Cov kev sib tw hauv qab puas tso cai hauv chaw ua haujlwm?

Cov txheej txheem:

Cov kev sib tw hauv qab puas tso cai hauv chaw ua haujlwm?
Cov kev sib tw hauv qab puas tso cai hauv chaw ua haujlwm?
Anonim

Kev teeb tsa ntawm cov kev sib tw hauv qab yuav tsum yog tso cai hauv qab ntawm cov pob zeb lossis lwm yam khoom siv hauv avlossis hauv chaw ua haujlwm nyob qhov twg nteg dej ntws nrog cov pob zeb hauv pem teb thiab npog nrog linoleum lossis sib npaug hauv pem teb cover.

Dab tsi yog qhov sib txawv ntawm txoj kev sib tw thiab cov kav dej?

Conduit yog lub raj lossis lub qhov dej tiv thaiv hluav taws xob. Cov kav dej kuj tuaj yeem raug xa mus rau cov kav dej, yeeb nkab, raj, channel, gutter lossis trench. Ib txoj kev sib tw yog ib qho txuas txuas uas tsim ib txoj hauv kev rau kev xa hluav taws xob.

Kev sib tw hauv qab yog dab tsi?

Ib qho kev sib tw hauv qab muaj ntawm cov ducts pw hauv qab ntawm hauv pem teb thiab sib cuam tshuam los ntawm kev tshwj xeeb cam khwb cia-hlau pem teb hlws ris thawv. Cov ducts rau underfloor-raceway systems yog ua los ntawm fiber ntau los yog steel.

NEC tsab xov xwm twg muab cov kev cai tshwj xeeb rau cellular qhob pem teb raceways?

295. Txoj Cai Hluav Taws Xob Hauv Tebchaws piav qhia txog "kev sib tw ntawm tes ntawm tes hauv pem teb" nyob rau hauv thaj tsam ntawmTshooj 372raws li "qhov khoob hauv cov plag tsev tsim los ntawm precast cellular-concrete slabs, nrog rau cov hlau tsim nyog tsim los muab nkag mus rau hauv pem teb cell." Ib lub xovtooj tau txhais hauv NEC Sec.

Puas yog txoj kev sib tw hluav taws xob ntau tshaj plaws siv hauv txhua hom kev tsim kho?

Txoj kev sib tw tshaj plaws yog conduit (ob leegcov hlau thiab nonmetallic) thiab cov ntawv hlau-hlau hlau ntawm ntau yam kev teeb tsa.

Pom zoo:

Nthuav cov khoom
Vim li cas cov neeg caij dav hlau yog poj niam?
Nyeem ntxiv

Vim li cas cov neeg caij dav hlau yog poj niam?

Nws yog los ntawm lub sijhawm no uas lub luag haujlwm ntawm tus neeg saib xyuas lub dav hlau pib hloov zuj zus txhawm rau txhawm rau suav nrog kev saib xyuas ntau dua. Raws li qhov tshwm sim, dav hlau tau saib cov poj niam kws saib xyuas neeg mob los saib xyuas cov neeg caij tsheb hauv tsev.

Yog amorphous solids nkig?
Nyeem ntxiv

Yog amorphous solids nkig?

Amorphous khoom, ib yam noncrystalline solid nyob rau hauv uas atoms thiab molecules tsis koom nyob rau hauv ib tug meej lattice qauv. Cov khoom siv xws li iav, yas, thiab gel. Khoom thiab kua yog ob hom condensed teeb meem; ob leeg yog tsim los ntawm atoms nyob ze rau ib leeg.

Cov txuas hniav disulfide ua li cas?
Nyeem ntxiv

Cov txuas hniav disulfide ua li cas?

Disulfide daim ntawv cog lus koom nrog cov tshuaj tiv thaiv ntawm sulfhydryl (SH) sab chains ntawm ob cysteine residues: ib qho S - anion los ntawm ib pawg sulfhydryl ua raws li ib tug nucleophile , tawm tsam sab ntawm cov cysteine thib ob los tsim ib daim ntawv cog lus disulfide, thiab hauv cov txheej txheem tso tawm electrons (txo qhov sib npaug) hloov mus.