题目内容
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[主观题]
Thermosetting plastics are generally better than thermoplastic plastics in toughness and impact resi
stance.
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第4题
A thermosetting polymer like epoxy______
A.typically can not be recycled.
B.usually involves the mixing of two or more components which are then polymerized.
C.is relatively strong because molecules are crosslinked together.
D.can not be easily re-shaped after curing
E.all of the above