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前端边缘部分四是由内心冲压变形的管身前端部分2。
The front end edge portion 4 is formed by inwardly pressing and deforming the front end portion of the pipe body 2.
youdao
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前端边缘部分四是由内心冲压变形的管身前端部分2。
The front end edge portion 4 is formed by inwardly pressing and deforming the front end portion of the pipe body 2.
youdao