A key difference between a thermoplastic polymer and an elastomeric material like rubber is that ___

___.

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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发布时间：2022-12-04

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第1题

The key difference between a distributed system and a computer network is that in the former ______.

A．the system functions are more automatic

B．the number of computers is greater

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第2题

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The author claims that there is a difference in reading speed______.

A．among readers who have different experience

B．among all the readers

C．between the poorly educated and the highly educated

D．among the highly educated people

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第3题

appeal associate bet deny educate feature independent refresh stump usage

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feature independent refresh stump usage

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第4题