The intersection of two right circular cylinders is usually quartic curve.
2
当圆柱与圆台正交时，其相贯线可用一般方法作出，但其正面投影和水平投影上相贯线的最右点不能准确定位。
The line of intersection can be made with a general method when the cylinder and frustum of a cone are normal to each other.
3
建立了圆柱分支管y型三通的主管相贯线处的周长不变的条件，确定了相贯线为椭圆。
The invariablenes condition of circle girth of the join-line end of the main pipe was set up and the join-lines on Y-tee to be ellipse was made certain.
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