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http://blog.csdn.net/wuxiaoming1733/archive/2008/10/29/3175296.aspx
http://blog.csdn.net/wooin/archive/2006/12/30/1468797.aspx
http://blog.csdn.net/wooin/archive/2006/03/10/620791.aspx
http://blog.csdn.net/wuxiaoming1733/archive/2008/10/13/3068226.aspx
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