单项选择题

Thermosetting polymers have the distinct advantage of being chemically and thermally resistant materials used in many high-performance applications.

A.正确
B.错误
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Thermoset polymers are generally harder and stronger than thermoplastics and have better dimensional stability.
A.正确
B.错误
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Thermoplastics are mainly prepared by addition polymerization.
A.正确
B.错误
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