②如果一条直线与平面内两条相交直线都垂直，那么这条直线与这个平面垂直。 扩展资料： 一、平面的法向量 (normal vector of a plane)确定平面位置的重要向量，指与平面垂直的非零向量，一个平面的.
Vector Mechanics for Engineers Statics and Dynamics F.P. Beer, E.R
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