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一、准备知识1．两条异面直线到其公垂线段的中垂面距离相等,且等于公垂线段长的一半．2．两条异面直线上任意两点连线段的中点在其公垂线段的中垂面上．(证明提示:两条异面直线上任意两点连线段与其公垂线段的中垂面的交点为连线段的中点．)
First, prepare for knowledge The distance from the two non-straight-line lines to the middle vertical plane of its perpendicular line segment is equal and equal to half of the length of the vertical line segment. 2. The midpoints of any two point segments on two different straight lines are on the mid-horizontal plane of its vertical line. (Proof reminder: The intersection point between any two point line segments on two different straight lines and the middle vertical line of its vertical line is the midpoint of the line segment.)