题目内容

点的投影连线一定垂直于相应的投影轴。

A. 对
B. 错

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根据课文内容填空Laughter _______us with other people.

Studies find that we are 30 times more _________to laugh with other people than alone.

Most laughter is about _______friendly with other people.

Some thing are _______because we don't ecpect them.

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