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
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回缩修剪的对象主要是一年生枝。( ) 正确 错误
单项选择题
Through controlled living free-radical polymerization (CRP), molecular weight distribution could be narrowed greatly, and PDI could be near to 1.
A.正确
B.错误
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