呆呆地

http://blog.csdn.net/lihenair/archive/2010/01/06/5133813.aspx http://blog.csdn.net/ITCamel/archive/2009/08/02/4400743.aspx http://blog.csdn.net/summersunboy/archive/2009/10/21/4707685.aspx http://kinglaw05.blog.163.com/blog/static/59683314200911205510345/#comment=fks_083071087086087071093085083095081095087075087085087071 http://blog.csdn.net/chenjingli1988/archive/2009/12/06/4949015.aspx http://osfromscratch.org/bookscn/7-achapter02cn