线材拉伸时受到三个外力即线端的拉伸力、模孔变形区的正压力、线材后端的反拉力。-查字典考试网

线材拉伸时受到三个外力即线端的拉伸力、模孔变形区的正压力、线材后端的反拉力。

1、正确
2、错误

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正确答案：

错误

答案解析：

暂无解析

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