种类不是C4^4, 应该是2^4=16

来源: 随风而来于 2009-06-04 21:38:52 [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.