1, Polystyrene (PS).Feem ntau hu ua cov roj hmab tawv, yog cov xim tsis muaj xim, pob tshab, glossy granular polystyrene cov khoom muaj raws li hauv qab no a, cov khoom siv kho qhov muag zoo b, cov khoom siv hluav taws xob zoo c, txheej txheem molding yooj yim d.Cov xim zoo nkauj e.Qhov loj tshaj qhov tsis zoo yog brittleness f, nws ...
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