已知一个多面体的直观图及三视图如图所示点在棱上截面二面角的大小为 1求证点为棱的中点 2求证 3设与的交点为求三 Template




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tomski已知一个多面体的直观图及三视图如图所示点在棱上截面二面角的大小为 1求证点为棱的中点 2求证 coloring