The projecting portion 3 are formed by inwardly pressing and deforming a neighborhood of a front end portion of a metallic pipe body 2.
部分的预测由3人组成的内心冲压变形的一个金属管机构2前端部分街道。
The projecting portion 3 are formed by inwardly pressing and deforming a neighborhood of a front end portion of a metallic pipe body 2.
部分的预测由3人组成的内心冲压变形的一个金属管机构2前端部分街道。
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