题目内容

How does the crystallinity affect the optical properties of plastics？ Give examples to explain the e

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______ provides the substrate for CD-ROMs because they possess excellent optical properties as well

A. Polystyrene (PS) foam
B. Polycarbonates (PC)
C. Polyvinyl chloride (PVC)
D. Polyethylene (PE)

Trade name for aramid fiber, which is used for bulletproof vests and advanced composites for aerospace applications.

A. E-glass
B. Kevlar
C. Borsic
D. Graphite

沥青混合料配合比设计内容包括和两部分。

针入度指数(PI)越大，沥青的感温性越好。( )