单项选择题

Thermoplastics are mainly prepared by addition polymerization.

A.正确
B.错误
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单项选择题
Poly(1,4-cis-butadiene) has a higher Tg than Poly(1,4-trans-butadiene) because the cis -form reduces the energy barrier for rotation of adjacent bonds.
A.正确
B.错误
单项选择题
PVC and PAN have a lower Tg than amorphous polypropylene.
A.正确
B.错误
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