1. Cov khoom tseem ceeb ntawm cov ntaub ntawv yas 1. AS: tsis tshua muaj hardness, nkig, pob tshab xim, thiab xim tom qab yog xiav, uas tuaj yeem tiv tauj ncaj qha nrog cov tshuaj pleev ib ce thiab khoom noj. 2. ABS: Nws belongs rau engineering plastics, uas tsis yog ib puag ncig tus phooj ywg thiab muaj hardness siab. Nws tsis tuaj yeem yog d ...
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