判断题
回缩修剪的对象主要是一年生枝。( )
正确
错误
【参考答案】
错误
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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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单项选择题
In condensation polymerization, two monomers, dimers, trimers, tetramers, or oligomers, can react with each other at any time.
A.正确
B.错误
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