19.The structure of claim 18 in which each of the brackets has an L-shape with first and second legs, with the first and second portions being the first and second legs of the L-shape, respectively. 20.The structure of claim 14 in which each of the hanging components is an integrally...
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CompanyLogo 课程目的 本节课内容：了解塑料常用品种掌握常用塑料的结构式、主要性能及用途能够根据塑料制品的外形确定成型加工方法 塑料 概述 塑料是在玻璃态下使用的、具有可塑性的高分子材料。它以树脂为主要组分，加入各种添加剂，能在一定温度和压力下加工成形的各种材料的总称。塑料的组成：1）...