1. Qee daim tso zis tso quav yog tuab dua rau qhov kov, thiab qib ntawm daim ntawv no qis dua. Vim tias, nyob rau hauv rooj plaub ntawm tib qho hnyav, tus naj npawb ntawm daim ntawv tuab yog me me. Piv txwv li, D qib ntawv muaj ntau dua 270 daim ntawv ib 500 grams, thaum ntawv E qeb tsuas muaj 250 daim ntawv lossis tsawg dua. Yog li, nyob rau hauv rooj plaub ntawm tib qho hnyav, koj yuav tsum xaiv tag nrho cov pob ntawm cov ntawv nyias ua nyias.
2. Txij li cov ntawv tso zis tso muag yog muag los ntawm qhov hnyav, ib qho chaw tsim khoom yuav ntxiv ntau cov ntim dej ntxiv thaum cov khoom tiav. Daim ntawv tsim tawm hauv txoj kev no yog tuab thiab tawv, uas yog qhov tsim kev puas tsuaj rau tib neeg lub cev. Yog li, koj yuav tsum xaiv cov ntawv mos muag muag thaum muas.
3. Tag nrho cov txheej txheem ntawm cov ntawv tso zis tso quav ua tiav hauv qhov kub kub. Yog tias qhov kev ntim khoom tsis ncav sijhawm, tsis tiav lossis khaws tsis raug, daim ntawv yuav ntub thiab tsis huv. Yog li no, thaum xaiv, koj yuav tsum xaiv cov khoom lag luam uas ntim tau zoo thiab muaj lub sijhawm tsim tawm tsis ntev los no.
4. Ua zoo mloog rau kev lag luam tus qauv ntawm cov ntaub so quav (QB2500-2000) muab los ntawm Ministry of Light Industry. Tus txheej txheem faib cov ntaub so quav hauv cov ntawv me rau hauv ntawv yob thiab riam txiav cov ntawv. Cov ntsuas txheej txheem tau muab faib ua A, B, C, D, Tsib theem ntawm E. Riam-txiav daim ntawv rau kev siv quav tso quav yog ob theem ntawm D thiab E. Thaum yuav khoom, thov ua tib zoo mloog cov lus ntawm pob. Yog tias kev ua raws li cov qauv tau teev tseg saum toj no: GB2500-2000 D-1, nws txhais tau tias nws yog qeb D. Cov ntawv, zoo zoo