1. Vim tias feem ntau lub raj mis yas yog PET lub raj mis, uas yog tshuab moulded, cov duab puag ncig yog tsim tau zoo tshaj plaws hauv cov khoom. Lwm yam duab suav nrog cov square tsis yooj yim rau tshuab, thiab cov khoom siv tes ua yog qhov nyuaj rau lav, txawm tias zoo li cov tshuaj yej khov. Nws yog lub raj mis square, qhov tseeb, cov npoo tau muab sib npaug, thiab nws tsis tuaj yeem ua kom muaj xwm txheej tag nrho.
2. Cov duab puag ncig yog ntau dua nrog cov qauv ntawm tib neeg lub cev, uas yooj yim rau tuav.
3. Hloov lub raj mis tau yooj yim los tsim, txuag cov ntaub ntawv, muaj ib puag ncig ib yam, thiab muaj thaj tsam puag ncig loj. Zoo li dej huv thiab cola, tus nqi ntawm cov khoom ntim yog siab dua tus nqi ntawm cov khoom. Txuag lub ntsiab lus no tuaj yeem txuag nyiaj ntau.
4. Ntxiv rau, cov fwj puag ncig yog siv tau zoo tshaj plaws ntawm cov kab sib dhos tsis siv neeg. Sau, sau tsis siv neeg, thiab ntim khoom tuaj yeem siv tau txhua lub sijhawm, yog li cov fwj dej haus ntau dua.
