1) unruled quadric
非直纹二次曲面
2) Quadric rvler surface
二次直纹曲面
3) Quadric ruled surface
二次直纹面
1.
Quadric ruled surfaces are divided into degenerated quadric ruled surface and the non-degenerated quadric ruled surface.
二次直纹面是空间解解析几何的主要內容之一,二次直纹面分为退化的二次直纹面和非退化的二次直纹面,非退化的二次直纹面有单叶双曲面、双曲抛物面以及二次柱面、二次锥面。
4) non-developable ruled surface
非可展直纹曲面
5) non revolution quadric surface
非回转二次曲面
1.
According to the geometrical characteristics that the cross line of non revolution quadric surface and two groups of parallel plane in specific direction is circle,a method is studied in which the solid form of non revolution quadric surface being cut by given plane may be solved directly and accurately through drawing auxiliary spherical surface which contains the circles.
根据非回转二次曲面与特定方向的两组平行平面束相交为圆截面的几何特性 ,论述了通过包含圆截面作辅助球面 ,可以直接、准确地求解非回转二次曲面截交线实形的作图方法。
6) quadratic aspherical surface
二次曲线非球面
1.
Improvement of designing flat gauge of quadratic aspherical surface;
二次曲线非球面片状样板设计方法的改进
补充资料：非直
1.不但﹔不仅。
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