题目内容：
从底面半径为1，高为4的圆柱体中掏出一个长方体，然后再在这个长方体中掏出一个最大的圆柱体，则掏出的圆柱体体积最大为（ ）。
参考答案：
答案解析：
单选题：从底面半径为1，高为4的圆柱体中掏出一个长方体，然后再在这个长方体中掏出一个最大的圆柱体，则掏出的圆柱体体积最大为（
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同时打开直径为A与直径为8的水龙头放水，1分钟后能够装满水槽。如果只打开直径为A的水龙头，要花多少分钟(T)才能装满?
同时打开直径为A与直径为8的水龙头放水，1分钟后能够装满水槽。如果只打开直径为A的水龙头，要花多少分钟(T)才能装满?
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