APP A natural or synthetic polymericelastic material. Natural rubber is a poly-mer of methylbuta-1,3-diene (iso-prene).Various synthetic rubbers aremade by polymerization; for examplechloroprene rubber (from 2-chlorobuta1,3-diene) and silicone rubbers.See als......（本文共 327 字） [阅读本文] >>
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