如图所示在四棱锥s abcd中底面abcd是正方形侧棱sd⊥平面abcdsd=dc点e是sc的中点作ef⊥sb交sb于点f.1 Template




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tomski如图所示在四棱锥s abcd中底面abcd是正方形侧棱sd⊥平面abcdsd=dc点e是sc的中点作ef⊥sb交sb于点f.1 coloring