The radius of the base of the cylinder is equal to the diameter of the base of the cone, and the ratio of the height of the cylinder to the height of the cone is (2/3), then the volume of the cylinder is the volume of the cone.
圆柱的底面半径等于圆锥的底面直径，圆柱的高与圆锥高的比是(2/3)，那么，圆柱体积是圆锥的多少．
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