Thx, my earth radius is too long ,if it is 6370km,the answer is

来源: jinjing 于 2011-09-15 10:16:25 [] [旧帖] [给我悄悄话] 阅读数 : (59 bytes)
回答: 84 由 guest007 于 2011-09-15 09:56:00

Welcome back,I miss you...at first I forgot 2pai,...

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• 6370/6400*85=84 -jinjing- ♀ 给 jinjing 发送悄悄话 (0 bytes) () 09/15/2011 postreply 10:17:40

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