为什么a4纸的长宽比是√2,而不是21�?因为例用了数学,创造了完美的造纸系统 知乎 Template




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tomski为什么a4纸的长宽比是√2,而不是21�?因为例用了数学,创造了完美的造纸系统 知乎 coloring