Dab tsi yog cov ntsiab lus kom nco ntsoov thaum tswj pob zeb?
Dec 12, 2020
1. Cov zaub mov cov khoom noj xws li marble thiab dawb marble yuav tsum tau waxed thiab tswj thaum lub sijhawm zoo tib yam. Sim tsis txhob siv cov khoom hlau los sib tsoo nrog nws, txwv tsis pub nws yuav ua rau pob zeb puas.
2. Siv tus kws tshaj lij cov tshuaj tiv thaiv-seepage rau ntawm lub pob zeb thiab ua kev tiv thaiv nkag mus rau nws, thiaj li tiv thaiv cov khoom sab nraud kom nkag mus thiab ua rau lub pob zeb zoo.
