2000 hom kev nce qib sib txawv

Cov yam ntxwv ua tau: Kev siv roj ntxiv, cov qauv sib npaug (0.16 - Kev saib xyuas ntau dua). Nruab Nrab Siv Nruab Nrab ≥ N68 #, grease nlgi000 # - 50 hli, txhua pab pawg ntawm cov khoom siv lubrication cov ntsiab lus: 3 - 20 ntsiab lus.