题目内容

Chemical that serves as "molecular matchmaker9' necessary to begin polymerization reaction.

A. Monomer B．lsotope C．Catalyst D．Filler

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学龄前儿童少尿

A. ＜400ml／d
B. ＜300ml／d
C. ＜200ml／d
D. ＜500mFd
E. ＜600ml／d

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

______ 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