又算錯,周期T約=85分.
所有跟帖:
• 84 -guest007- ♂ (148 bytes) () 09/15/2011 postreply 09:56:00
• Thx, my earth radius is too long ,if it is 6370km,the answer is -jinjing- ♀ (59 bytes) () 09/15/2011 postreply 10:16:25
• 6370/6400*85=84 -jinjing- ♀ (0 bytes) () 09/15/2011 postreply 10:17:40