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, zoo kho qhov muag khoom b, zoo heev hluav taws xob khoom c, yooj yim molding txheej txheem d. Cov xim zoo nkauj e. Qhov loj tshaj qhov tsis zoo yog brittleness f, nws ...
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