多项选择题

（多选题）价值的特性包括： A.
主体性 B.
客观性 C.
多维性 D.
社会历史性

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单项选择题
The formation of cross-linked structures in synthetic rubbers is usually called vulcanization. After vulcanization, there are still many carbon-carbon double- bonds in the molecular chains of natural rubber.
A.正确
B.错误
单项选择题
Glass transition related closely to molecular motions.
A.正确
B.错误
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