题目内容

点的正面投影由坐标值确定,水平投影由坐标值确定,侧面投影由坐标值确定。

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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。

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