Sorry, It should be: (R+r-h)h=(R+r)^2-R^2-h^2,...

来源: jinjing 于 2011-08-15 17:33:49 [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.