Their conical sphenoid part, for the configuration of which at least four conical surfaces are used, can have the same cross section all over its length or different cross-section per parts.

 
  • 圆锥楔形体的结构至少有四个圆锥面组成,在每个面上,可以使用相同的横截面,也可用不同的横截面。
今日热词
目录 附录 查词历史