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  2. 问题

垂直于V面的直线称为铅垂线。

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垂直于V面的直线称为铅垂线。

A.正确

B.错误

参考答案:

答案：B

相关问题:
  • 垂直于一个投影面，平行于另外两个投影面的直线称为投影面平行线。
  • 当直线(或平面)平行于投影面时，其投影为一点(直线)，这种性质叫积聚性。
  • 对三个投影面均倾斜的直线称为一般位置线。
  • 既不平行，又不相交的两直线，一定不存在。
  • 空间两直线的相对位置有平行、相交、交叉三种。
  • 两直线相交，其三面投影必然相交，并且交点为两直线的共有点。
  • 两直线平行，其同名投影一定平行。
  • 平行于V面的直线称为侧平线。
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