Cov khoom

Peb lub tuam txhab yog cov chaw tsim khoom siv nqus tsev. Peb tuaj yeem muab cov khoom siv raws li qhov xav tau tiag tiag ntawm cov neeg siv khoom hauv ntau yam lag luam, xws li: kev ua thiab tsim cov tuam txhab RV; kev tsim tsheb; kev ua thiab tsim cov pas nrig thiab cov blocks semiconductor silicon; kev tuav cov roj teeb tshiab; kev ua iav tob; kev teeb tsa phab ntsa iav, thiab lwm yam. Nyeem Ntxiv