题目内容

当两个点的水平投影产生重影点时,则两点的坐标相等,坐标不相等;当两个点的正面投影产生重影点时,则两点的坐标相等,坐标不相等;当两个点的侧面投影产生重影点时,则两点的坐标相等,坐标不相等。

查看答案

搜索结果不匹配？点我反馈

更多问题

People often talk about business at _____

A. breakfast time
B. lunch hour
C. coffee time
D. dinner time

It’s time for people to get to know a person at _____

A. breakfast time
B. lunch hour
C. coffee time
D. dinner time

During business travels, people usually talk about business during _____ for urgency.

A. breakfast time
B. lunch hour
C. coffee time
D. dinner time

Breakfast meetings rarely last more than an hour. The underlined word here means _____.

A. seldom
B. often
C. always
D. occasionally