... openings through or near welded joints 通过或靠近焊缝处的开孔 roundness tolerance 不圆度公差 Heat exchangers 热交换器 ...
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penstock roundness tolerance 钢管圆度偏差
And variable guiding force is good for roundness tolerance.
变导向力可以使环件的圆度误差较小。
参考来源 - 环件轧制中导向辊对环件圆度误差影响规律研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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