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Judging Theorem of Plane Parallelism: High School or Junior High School?
This theorem was in high school.

According to the official account inquiry of Jiao Yang Junior High School Mathematics WeChat, it is known that the plane parallelism judgment theorem is a compulsory course in senior high school. Face-to-face parallelism means that two planes are parallel. If two planes have nothing in common, they are parallel. Two planes are parallel if their perpendicular lines are parallel. If two intersecting lines in one plane are parallel to the other plane, then the two planes are also parallel.