Hnub no kuv xav qhia rau koj paub dab tsi yog cov qauv uas cov khoom siv yuav tsum tau ua kom ua tau lub thawv ntsuas?
1. Cov khoom siv yuav tsum yog nplaim hluav taws thiab tsis muaj kuab lom thiab tsis muaj pa luam yeeb.
2. Lub neej ua haujlwm ntawm lub thawv ntsuas hluav taws xob tau ntev, yog li lub neej ntawm cov khoom siv los ua lub thawv ntsuas hluav taws xob yuav tsum muaj tsawg kawg 20 xyoo.
3. Thaum muaj qhov sib txawv ntawm qhov kub, qhov ntsuas cua sov ntawm cov khoom siv los ua lub thawv ntsuas qhov ntsuas yuav tsum me dua li cov hlau.
4. Thaum ntsib cov tshuaj lom neeg hnyav xws li cov kuab tshuaj organic, ntsev, dej hiav txwv, kua qaub, dilute alkali, thiab lwm yam, nws yuav tsum muaj zog tiv taus xeb.
Plaub lub ntsiab lus saum toj no yog cov khoom siv yooj yim uas cov khoom siv ntawm lub thawv ntsuas hluav taws xob yuav tsum muaj.
