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大径指过外螺纹牙顶或内螺纹牙底的圆柱面直径。
The root of the external thread or the crest of the inner thread .
实验结果表明：相同径厚比的铸铁圆柱壳的破坏机理主要因素为变形不协调。
Experiment results shown that the main factor of the breakage reason of the cast-iron cylindrical shell with same diameter and thickness is that transform is not moderate.
本文主要介绍了单缸柴油机平衡轴两端圆柱轴径的一种多刀组合加工方法。
The paper mainly introduces a kind of multi-tool built-up processing method for balanced shaft diameter of single cylinder engine.
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