曲率半徑處處相等摩擦係數點點為零~~~

來源: lessisnotmore 於 2010-01-21 16:50:32 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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曲率半徑處處相等 摩擦係數點點為零~~~