回复：鸭在半径为x 的圆上与狐周旋于同一直径远端，不可能.

来源: guest007 于 2010-05-15 21:26:51 [档案] [旧帖] [给我悄悄话] 阅读数 : (64 bytes)

回答: I mean vf is larger than that, the duck still can free 由 guest007 于 2010-05-14 14:23:47

never mind- correct answer has been posted - let's move on then

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