你的答案比我知道的要好

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送交者: 匆匆过客 于 2006-09-29, 15:40:56:

回答: Assuming filling tank is instantaneous, then 6 planes are needed 由 outsider 于 2006-09-29, 15:15:55:

I think you can be proud and boast about it if you came up with it by yourself.


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