明確條件：在凸麵是重力-離心力；在凹麵是重力+離心力。

來源: 皆兄弟也於 2011-01-18 20:15:12 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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明確條件：在凸麵是 重力-離心力；在凹麵是 重力+離心力。