Dab tsi yog cov hlau ua npuas ncauj
Ua npuas ncauj hlau yog ib yam tshiab ntawm cov khoom siv nrog lub zog siab, lub teeb yuag, zoo heev thermal rwb thaiv tsev, suab rwb thaiv tsev thiab lub zog nqus cov khoom, uas tuaj yeem siv rau hauv aerospace, tsheb, lub zog, kev tsim kho thiab lwm yam. Commo...
saib kom meej