用若干个相切的圆圆的直径可以任意小去填一个平面,能否填满,若不能,应如何证明? 知乎 Template




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tomski用若干个相切的圆圆的直径可以任意小去填一个平面,能否填满,若不能,应如何证明? 知乎 coloring