觉得这个比较好：http://wenku.baidu.com/view/faf3373f580216fc700afd7d.html
总网站：http://www.baidu.com/index.php?tn=97230838_hao_pg#wd=6%E4%B8%8B%E8%AF%AD%E6%96%87%E7%AC%AC2%E5%8D%95%E5%85%83%E5%8F%A3%E8%AF%AD%E4%BA%A4%E9%99%85ppt&ie=utf-8&tn=97230838_hao_pg&f=8&rsv_bp=1&rsv_spt=1&rsv_sug3=3&rsv_sug4=91&inputT=3259&rsv_sug2=0&bs=%E5%9B%9B%E5%B9%B4%E7%BA%A7%E4%B8%8B%E5%86%8C%E8%AF%AD%E6%96%87%E8%AF%BE%E6%96%87%E7%AC%AC7%E8%AF%BE
