高速旋转时
是平板的阻力大?
还是圆柱的阻力大? ----圆柱半径与平板长边相同时
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好久不見阿。我長得這摩柳下恵、小三門之類的事件是不会出現在我身上的、
-ayun-
♂
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02/23/2010 postreply
21:03:58
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天哪你是不是学理科的,很简单的问题
-转眼又黄昏-
♂
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02/23/2010 postreply
21:38:13
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