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在高级中学课本《立体几何》全一册第24、25页中,给出直线和平面垂直的性质定理:如果两条直线同垂直于一个平面,那么这两条直线平行.
On the 24th and 25th pages of the “Three-Dimensional Geometry” book in the high school textbook, the property theorem of straight lines and planes is given. If two lines are perpendicular to a plane, the two lines are parallel.