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http://wenku.baidu.com/link?url=qhYCM4Me7T08qSGJz5FWH_hdzaMUl53A_yjidzS-OLmwJ9j4aNh6SvYR1mfrhKxwFrWvuQqjMX9rPW8c_QFjxhxoD9uDA8s-3GvBX-Uxu-q
http://blog.sina.com.cn/s/blog_718c9d790100siaq.html
http://developer.51cto.com/art/200908/144227_2.htm
http://www.cnblogs.com/lanix/archive/2012/04/02/2429492.html
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原文地址:http://www.cnblogs.com/csharphuang/p/4187337.html