单项选择题

Polycarbonate has a lower Tg than polyethylene.

A.正确
B.错误
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单项选择题
Semicrystalline polymer is formed in a temperature range from Tg to Tm
A.正确
B.错误
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Totally elastic deformation occurs very quickly, and the strain is independent of time.
A.正确
B.错误
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