The authors show that the hyperboloidofonesheet and the hyperbolic paraboloid are ruled surfaces.
作者证实：单叶双曲面和双曲抛物面是直线曲面。
2
The authors show that the hyperboloidofonesheet and the hyperbolic paraboloid are ruled surfaces.
单叶双曲面和双曲抛物面是直线曲面。
3
It's introduced in this paper how to draw the engineering drawing of the plow surface formed by a combination of a oblique helicoid and a hyperboloidofonesheet.