哈哈,曲率半徑處處相等,摩擦係數點點為零.
所有跟帖:
• LOL, thanks. -jill08- ♀ (0 bytes) () 05/17/2010 postreply 18:48:43
• LOL, thanks. -jill08- ♀ (0 bytes) () 05/17/2010 postreply 18:48:43
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