I mean if Vf is less than that.
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I mean vf is larger than that, the duck still can free
-guest007-
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05/14/2010 postreply
14:23:47
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鸭在半径为x 的圆上与狐周旋于同一直径远端,不可能.
-jinjing-
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05/14/2010 postreply
15:52:06
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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.
-guest007-
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05/15/2010 postreply
21:26:51