两圆柱面相切处的切平面，如垂直于投影面，则在该投影面的视图上应该画线。
查看答案
组合体如果不是叠加式的，就一定是切割式的。
A. 对
B. 错
It was a small room on the sixth floor, and hardly a setting for a romantic figure.
A. character
B. story
C. picture
Ausable was, for one thing, fat.
A. just a little
B. for one reason
C. generally
Some day soon that paper may well affect the course of history.
A. will quite probably
B. will to a great extent
C. will positively
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