单项选择题

Additives are external substances purposely added to change properties of polymers or resins.

A.正确
B.错误
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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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