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怎样在圆管上开圆孔

更新时间: 2021-03-17 11:52:54     

1、首先,两个圆柱交线不是一个平面曲线,也就不是椭圆了。

2、不过从你发的黑三通图上看去,就是侧脸,交线是那是两条垂直的直线相交。所以可以从侧面看,从侧面画,然后做一个纸的等腰直角三角形,三角形的图形和交线的测视图一样,然后用铅笔一点一点描,和三角形两个直角边重合。

关键词: 怎样

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