用一个平面斜截一个上下无限延伸的圆柱得到的截面是椭圆吗?为什么截圆锥和截圆柱都能得到椭圆 知乎 Template




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tomski用一个平面斜截一个上下无限延伸的圆柱得到的截面是椭圆吗?为什么截圆锥和截圆柱都能得到椭圆 知乎 coloring