金属结构件表示法 Representation of structural metal work
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金属结构件及化工机械备件、配件，金属机械加工热处理等。
The metals structure piece and chemical engineering machine spare parts, accessories, the metals machine processes the hot processing etc…
塔吊的紧固金属结构的联接螺栓和销轴，结构件不得有变形，焊缝不得有裂纹。
The bolt fastening metal structure of tower crane and pin structure without deformation, no weld crack.
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