如图所示是三棱锥d abc的三视图点o在三个视图中都是所在边的中点则异面直线do 和ab所成角的余弦值等于 A b c D Template




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tomski如图所示是三棱锥d abc的三视图点o在三个视图中都是所在边的中点则异面直线do 和ab所成角的余弦值等于 coloring