参考:http://www.cnblogs.com/allin/archive/2010/05/15/1736458.html
http://www.cnblogs.com/allin/archive/2010/05/15/1736462.html
参考:http://www.cnblogs.com/allin/archive/2010/05/15/1736458.html
http://www.cnblogs.com/allin/archive/2010/05/15/1736462.html
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