题目内容

______ 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)

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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。( )

为保证混凝土的耐久性，在混凝土配合比设计中要控制和。