Los ntawm kev qhia thiab tsis qhia tawm?

Cov txheej txheem:

Los ntawm kev qhia thiab tsis qhia tawm?
Los ntawm kev qhia thiab tsis qhia tawm?
Anonim

Qhov sib txawv tseem ceeb ntawm kev coj ua thiab kev tshaj xov xwm tsis muaj kev taw qhia yog kev tshaj tawm siv lub cev los yog tus neeg xyuas pib xa cov teeb liabwhereas, cov xov xwm tsis muaj kev tshaj tawm tshaj tawm cov teeb liab los ntawm huab cua. Cov xov xwm qhia tseem hu ua kev sib txuas lus los yog kev sib kis sib kis.

Dab tsi yog kev coj ua thiab tsis muaj kev tshaj tawm piav qhia nrog piv txwv?

Guided − Nyob rau hauv kev tshaj tawm, cov ntaub ntawv xa mus los ntawm cov kab ke uas muaj txoj hauv kev ruaj khov. Piv txwv li, tooj liab xov hlau, fiber ntau optic xov hlau, thiab lwm yam. Unguided - Nyob rau hauv unguided media, cov ntaub ntawv xa mus los ntawm qhov chaw dawb nyob rau hauv daim ntawv ntawm electromagnetic teeb liab. Piv txwv li, xov tooj cua tsis, lasers, thiab lwm yam.

Cov xov xwm qhia yog dab tsi?

Cov xov xwm qhia, uas yog cov uas muab cov kav dej ntawm ib lub cuab yeej mus rau lwm qhov, suav nrog Twisted-Pair Cable, Coaxial Cable, thiab Fiber-Optic Cable. Lub teeb liab taug kev raws ib qho ntawm cov xov xwm no yog qhia thiab muaj los ntawm kev txwv lub cev ntawm qhov nruab nrab.

Yuav ua li cas ceev tshaj tawm xov xwm lossis xov xwm tsis qhia?

Guided thiab cov xov xwm tsis qhia, tseem hu ua wired thiab wireless hom kis tau tus mob. Kev piav qhia: Cov xov xwm qhia tau muaj suab nrov tsawg dua thiab muaj teeb meem hauv kev sib piv rau cov xov xwm uas tsis muaj kev taw qhia, qhov no ua rau cov xov xwm coj los muab cov ntaub ntawv xa mus sai dua li cov xov xwm tsis muaj kev taw qhia.

Dab tsi yog qhov zoo thiab qhov tsis zoo ntawm kev tshaj tawm xov xwm tshaj tawm xov xwm tsis muaj kev piav qhia nrog kev pab piv txwv?

Nyob fiber ntau optical yog suab nrov tsis kam, muaj lub teeb liab tsawg dua thiab muajib qho bandwidth ntau dua piv rau cov hlua sib tw thiab coaxial cable. Cov xov xwm tsis muaj kev taw qhia tseem hu ua kev sib txuas lus wireless. Nws tsis tas yuav muaj lub cev nruab nrab los xa cov cim hluav taws xob.

Pom zoo:

Nthuav cov khoom
Lub sijhawm elongation ntawm kev txhais lus uncharged trnas txav mus rau?
Nyeem ntxiv

Lub sijhawm elongation ntawm kev txhais lus uncharged trnas txav mus rau?

Peptide daim ntawv cog lus; uncharged tRNA txav mus rau qhov E site & tom qab tawm ntawm ribosome; lub mRNA tau hloov pauv 3 lub hauv paus mus rau sab laug, ua rau tRNA bearing dipeptide hloov mus rau P site P site P-site (rau peptidyl) yog qhov thib ob khi qhov chaw rau tRNA hauv ribosome.

Dab tsi yog asbestiform fibers?
Nyeem ntxiv

Dab tsi yog asbestiform fibers?

Raws li siv hauv daim ntawv tshaj tawm no, lo lus asbestiform fibers suav nrog fibers uas muaj lub zog zoo thiab yoog raws, ruaj khov, cov qauv saum npoo tsis muaj qhov tsis xws luag, thiab ntau lwm yam khoom tau piav qhia tom qab. Kev lag luam zoo asbestos yog ib qho piv txwv ntawm asbestiform fiber.

Colleen dewhurst tuag li cas?
Nyeem ntxiv

Colleen dewhurst tuag li cas?

Dewhurst tuag rau hnub Thursday ntawm mob qog noj ntshav ntawm nws lub tsev hauv New York suburb ntawm Lewisboro, hais Tom Viola, tus kws tshaj lij rau lub koomhaum uas nws ua haujlwm, Tus Ua Yeeb Yam Equity. Txawm hais tias ntau phau ntawv sau npe Dewhurst hnub nyoog li 65, nws yog 67, hais tias nws tus khub ntev, Ken Marsolais.