为什么绕y轴旋转一�后计算体积会有1这个点作为分割线来计算而不是直接用π来乘以后面的两个相减的式子? 知乎 Template




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tomski为什么绕y轴旋转一�后计算体积会有1这个点作为分割线来计算而不是直接用π来乘以后面的两个相减的式子? 知乎 coloring