大约有千分之0.3. 即一万个里有板有3个.

来源: 阿里于 2009-07-18 02:18:16 [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.