Hauv lub neej txhua hnub, qhov ntsuas hluav taws kub ntawm cov khoom siv hauv tsev tuaj yeem muab faib ua A, B1, B2, thiab B3 qib.Class A tsis yog nplaim taws.B1 yog non-flammable, B2 yog flammable, thiab B3 yog flammable.Synthetic resin vuas siv los ua vov tsev cov ntaub ntawv, thiab qhov hluav taws kub ntsuam xyuas yuav tsum siab tshaj B1, uas yog, nws doe ...
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