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 Sketch Coloring Page

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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sketch #4934 Nami-Ki Roberto Castro Colimil

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sketch #3656 Igor by Vincent Baudement

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sketch #3499 Alien Laura Gutierrez Hinojosa

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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

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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 sketch template

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