A conical block-shaped container with a height of 12 cm is filled with water, and then all the water is poured into a cylindrical container with the same bottom as it. What is the height of the water surface in cm?
一个圆锥形块状的容器，高12厘米，里面装满了水，然后把水全部倒入与它等底的圆柱容器里，水面高多少厘米．
<result>4</result>