Xov Xwm

Qhov piv txwv no qhia tau hais tias yuav ua li cas thiaj ua txhaum kev txheeb xyuas cov khoom sib dhos uas muaj cov cim nrawm nrawm, tshwj xeeb tsh...

Cov kabmob sib koom ua ke yog ib hom ntawm cov kheej kheej muaj cov kabmob, zawv zawg tiv thaiv nto yog sab hauv kheej kheej thiab sab nrauv, sab n...

Zawv zawg kabmob, zawv zawg kabmob), ua haujlwm nyob hauv qab zawv zawg bearings.Xav cov kabmob ua haujlwm khov kho, txhim khu kev ntseeg, tsis mua...

Kev hloov pauv thiab hloov dua tshiab ntawm Suav kev tsim cov khoom lag luam kev lag luam ntau lawm thiab kev lag luam kev thov kwv yees thiab txhe...

Kev ntsuas lub zog sib luag Los piv rau cov kabmob ntawm cov kabmob muaj peev xwm ntawm txoj kev pitting, cov kev cai cov kabmob ntsuas lub neej mu...

lub neej Nyob rau hauv qee yam kev thauj khoom, kev coj tus kheej thaum pitting kev ua ntej lub kiv puag ncig lossis teev, hu ua lub neej txoj sia....

Kev txheeb xyuas kev lag luam Raws li National Bureau of Statistics, nyob rau hauv 2011 Suav teb cov khoom lag luam tsim kev lag luam loj (cov ny...

Raws li National Bureau of Statistics, nyob rau hauv 2011 Tuam Tshoj cov kabmob tsim kev lag luam nplai (cov nyiaj tau los txhua xyoo muag khoom ...

Hauv 883, cov neeg nuv ntses muab tso rau pem hauv ntej siv lub tshuab tsim khoom tsim nyog zoo ib yam thiab qhov loj thiab qhov tseeb ntawm cov n...

Lub pas dej Nanoscale hauv tebchaws Ltalis pom ib lub nkoj tsim nyob rau hauv 40 xyoo BC hauv lub nroog Loos thaum ub, tau pom cov piv txwv ntawm...

Cov qauv thaum ntxov ntawm cov kab tawm ncaj ncaj bearings, tau muab tso rau hauv kab ntawm pry phaj hauv kab ntawm cov ntoo ncej.Modern linear mot...

Cov kabmob (kabmob) yog ib hom tseem ceeb ntawm cov tshuab niaj hnub thiab cov khoom siv.Yog lub luag haujlwm tseem ceeb yog txhawb nqa cov neeg kh...