1. Tshawb xyuas seb puas muaj plua plav thiab cov khib nyiab nyob ib puag ncig lub hnab ntim tshuab luam ntawv thiab tshem tawm lawv.
2. Thauj cov yeeb yaj kiab yob raws li qhov yuav tsum tau ua ntawm daim ntawv ceeb toom ntau lawm.
3. Kho qhov loj ntawm lub hnab raws li daim ntawv ceeb toom ntau lawm thiab cov txheej txheem cov ntaub ntawv, nruab lub tshav kub-sealing riam, thiab pib kho cov hauj lwm ntawm lub slitting riam thiab kub-sealing riam.
4. Tig lub hwj chim ntawm lub hnab ntim tshuab luam ntawv thiab teeb tsa qhov kub ntawm lub tshav kub-sealing riam los luam tawm raws li qhov yuav tsum tau ua ntawm cov ntaub ntawv txheej txheem.
5. Nkag mus rau cov ntaub ntawv cuam tshuam ntawm kev tsim lub hnab thiab tus lej xav tau ntawm txhua pob.
6. Xaiv lub ntug ntawm cov qauv nrog cov xim loj dua qhov sib txawv los kho qhov rhiab heev ntawm qhov muag qhov muag kom nws ua tau raws li qhov yuav tsum tau ua.
