AMMA Acrylonitrile-methylmethacrylate copolymer丙烯腈一甲基丙烯酸甲脂共聚物 AMS Alpha methyl styrene a甲基苯乙烯 AS Acrylonitrile-styrene copolymer(see SAN)丙烯腈一苯乙烯共聚物 ..
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