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【单选题】
比较聚丙烯PP,聚氯乙烯PVC,聚丙烯腈PAN,聚乙烯PE之间的柔性,顺序正确的是:A.
PE>PP>PVC>PAN
B.
PE>PP>PAN>PVC
C.
PP>PE>PVC>PAN
D.
PAN>PVC>PP>PE
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