Nws muaj peb lub ntsiab lus tseem ceeb uas cuam tshuam txog kev poob lub nplhaib. Ua ntej, qhov poob vim los ntawm kev siv tsawg dua, ob, qhov teeb meem tus kheej ntawm kev sib tua, thiab qhov thib peb, qhov qub coj.
1, kev siv tsawg dua qhov poob vim los ntawm qhov kev xaiv tseem ceeb ntawm kev kaw lus tsis tsim nyog, qhov kev xaiv yog nyob ntawm qhov load, kev nruj, kev ceev, qhov loj thiab qhov yoog hloov thiab lwm yam kev cai.
2. Kev sib tua ntawm cov teeb meem, nrog rau kev tsim teeb meem, tsim kev siv cov khoom siv, kev tsim teeb meem ua haujlwm engineering, thiab lwm yam.
3, coj txawv, hnav thaum siv.
