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http://wenku.baidu.com/link?url=IrtnezMjmU7hX2S9seWIXXDlhtFY5q4UquDMDtL1ua1NV-MH3bWItHOxSztOWeCKDJubgIM6iJaIFho9ZGbbyLrKLcoJQBVOwaBpSrTJ5sO
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http://www.cnblogs.com/hustcat/archive/2009/10/28/1591648.html
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http://blog.itpub.net/13879334/viewspace-1035478/