单项选择题
A.苯乙烯 B.聚乙烯 C.氯乙烯 D.三聚氰胺
A.聚乙烯 B.聚丙烯 C.聚苯乙烯 D.聚氯乙烯
A.120℃ B.140℃ C.170℃ D.190℃
A.-15～-20℃；50%-60% B.-20～-30℃；60%-70% C.-30～-35℃；70%-80% D.-25～-30℃；80%-90%
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