cylinder and a cone have the same volume, the area of the base of the cone is 1/2 that of the cylinder, and how many times the height of the cone is the height of the cylinder
一个圆柱和一个圆锥的体积相等，圆锥的底面积是圆柱的(1/2)，圆锥的高是圆柱高的多少倍
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