关于一类旋转曲面的切面

On Exterior Contact of a Class of Revolving Curved Surface

给出并证明过长形旋转椭球面、双叶旋转双曲面、旋转抛物面的旋转轴上一点关于该旋转曲面的切面的几何确定;给出并证明过长形旋转椭球面、双叶旋转双曲面、旋转抛物面的旋转曲面外的垂直于该旋转轴的一直线关于旋转曲面的切面的几何确定.

The paper gives and proves the long shape ellipsoid of revolution surface, the double leaf revolving hyperboloid, and on the revolving paraboloid rotation axis about this revolving curved surface the section geometry determination; It gives and proves the that＇ through long shape ellipsoid of revolution surface, double leaf revolving hyperboloid, and outside revolving paraboloid revolving curved surface and vertical to this rotation axis the section geometry determination of the straight line about the revolving curved surface.