Cov khoom piav qhia:
Cov ntaub ntawv hloov pauv VOID ib nrab yog cais cov seem qis thiab cov residue siab.Kev ruaj ntseg zais cov lus / qauv nthuav tawm nws tus kheej nrog ib feem nplaum ntawm cov ntawv nqa nqa thiab daim ntawv thov saum npoo, qhia txog lub cev pov thawj ntawm kev tshem tawm.
Duab: