正方体ABCD-A'B'C'D'中P,Q分别是正方形AA'D'D,A'B'C'D'的中心.求证PQ//面AA'B'B
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![正方体ABCD-A'B'C'D'中P,Q分别是正方形AA'D'D,A'B'C'D'的中心.求证PQ//面AA'B'B](/uploads/image/z/5557638-30-8.jpg?t=%E6%AD%A3%E6%96%B9%E4%BD%93ABCD%EF%BC%8DA%27B%27C%27D%27%E4%B8%ADP%2CQ%E5%88%86%E5%88%AB%E6%98%AF%E6%AD%A3%E6%96%B9%E5%BD%A2AA%27D%27D%2CA%27B%27C%27D%27%E7%9A%84%E4%B8%AD%E5%BF%83.%E6%B1%82%E8%AF%81PQ%2F%2F%E9%9D%A2AA%27B%27B)
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