如图所示的四边形abcd是边长为2的正方形,对角线ac , bd相交于点o 将 Bda沿bd折起到 Bda的位置,使平面abd⊥平面bcd Template




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tomski如图所示的四边形abcd是边长为2的正方形,对角线ac , bd相交于点o coloring