回复：最后一条不正确。 It happens every month with 31 days and the first da

来源: 于 2011-03-31 12:49:08 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

It happens every month with 31 days and the first day is a Friday, for example October 2010 & May 2009.