一个四面体的展开图是一个三角形,当且仅当这个四面体为正四面体,三角形为正三角形,对吗? 知乎 Template




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tomski一个四面体的展开图是一个三角形,当且仅当这个四面体为正四面体,三角形为正三角形,对吗? 知乎 coloring