题目内容
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提问人:网友hsroyce
发布时间:2022-01-07
[主观题]
30 填空Thermoplastic elastomers mostly based on the (不相溶性) of different polymer chains within block copolymers.
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A.rubber has a relatively small number of covalent crosslinks and thermoplastic polymers have none
B.thermoplastics don't melt when heated but rubbers do
C.rubber can be subjected to extensive plastic deformation whereas typical thermoplastics have little plasticity
D.all of the above
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