科学网文章日期是2012-12-11，比方的话早。

来源: 侯凯于 2013-01-04 11:57:43 [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.