这类估算记得在那里见过，还有就是没有大气降落需要的能量至少等于起飞

来源: iwbb 于 2011-11-27 19:58:16 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.