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空间直线与平面平行问题是立体几何的重要内容,也是高考考查的重点,求解的关键是根据线与面之间的互化关系,或借助创设辅助线与面,找出符号
The problem of spatial parallelism and plane parallelism is an important content of the three-dimensional geometry, and it is also the focus of the college entrance examination. The key to solving is to find the symbols based on the mutual relationship between lines and surfaces, or by creating auxiliary lines and surfaces.