如图2-1，一个圆锥形容器的高为，内装有一定量的水.如果将容器倒

如图2-1，一个圆锥形容器的高为，内装有一定量的水.如果将容器倒置，这时所形成的圆锥的高恰为（如图2-2），则图2-1中的水面高度为；

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如图2-1，一个圆锥形容器的高为，内装有一定量的水.如果将容器倒

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