单项选择题

The formation of cross-linked structures in synthetic rubbers is usually called vulcanization.

A.正确
B.错误
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单项选择题
Common polymers, such as PE, PP, PVC, PSt, nylon, and PET have linear structures.
A.正确
B.错误
判断题
回缩修剪的对象主要是一年生枝。( ) 正确 错误
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