Nta thiab kev ceev faj ntawm peb-pov thawj ntaub
1. Cov khoom lag luam zoo tau lav, thiab kev pab cuam tom qab muag tuaj yeem muab rau cov neeg siv.
2. Cov khoom no yuav tsum zam kev sib tsoo nrog cov hlau ntse thaum siv.
3. Nws tuaj yeem ua tiav rau hauv kev mus pw tsev pheeb suab ntaub thiab sab nraud ntawm ntau lub tshuab thiab khoom siv.
4. Yog tias cov khoom puas ntsoog thaum siv, nws tuaj yeem kho nrog kua nplaum.
5. Nws muaj dej tsis tau thiab cov pov thawj ntawm cov yam ntxwv ntawm lub teeb, kua qaub thiab alkali tsis kam, yooj yim ntxuav thiab folding, thiab lwm yam.