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什么是垂直定义

更新时间: 2020-09-17 00:00:00     

1、两条直线相交成直角时,这两条直线互相垂直,其中一条直线是另一条直线的垂线,这两条直线的交点叫垂足。2、两条直线、两个平面相交,或一条直线与一个平面相交,如果交角成直角,叫做互相垂直。

关键词: 什么 垂直 定义

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