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冬日恋鬼
金属垫片 [词典] [化] metallic gasket; [例句]没有受力螺栓，省去了金属垫片或垫块；There are no bolts for axial stress of internal pressure and no metal gaskets.
大南瓜小咪咪
弯头：elbow法兰：flange钢板：steel plate管子：tube /pipe垫片：spacer螺栓：screw
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