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- 给 guest007 发送悄悄话 (497 bytes) () 05/14/2010 postreply 14:23:47

鸭在半径为x 的圆上与狐周旋于同一直径远端,不可能. -jinjing- 给 jinjing 发送悄悄话 (170 bytes) () 05/14/2010 postreply 15:52:06

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- 给 guest007 发送悄悄话 (64 bytes) () 05/15/2010 postreply 21:26:51

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