题目内容
In the stud joint, the screw end should be completely screwed into the threaded hole of thick parts.双头螺柱的连接中，旋入端要完全旋入厚零件的螺纹孔。
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The taper angle at the bottom of the threaded hole should be 90 degrees when drawing. 螺纹孔底部的锥角，绘图时应该画成90度
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