... 薄膜 membrane 板之中分面 middle surface of a plate 板之中分面 middle surface of plate ...
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The structure plate is composed of high-elastic structure, which is provided with an edge raised line, a middle raised line, a bottom flat surface and a bottom concave surface.
由高弹性结构构成，高弹性结构上设置有边凸条、中凸 条、底平面、底凹面；
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