1、http://www.xkbw.com/YuWenBei/UploadFiles_6495/200811/20081126100949922.ppt2、http://www.gxsdfz.net/upload/attachments/1+6689K7v84%3D_Y3o0d62o65nG.ppt3、http://www.jcbx.pudong-edu.sh.cn/uploads/soft/1_080917094447.ppt4、http://www.syzx.sdedu.net/xueke/yuwen/_private/banianji/2danyuan/zuihouyike.ppt自己挑选吧
