1、网易开源镜像站(各种linux发行版):http://mirrors.163.com/
2、字符集讲解:http://www.iteye.com/topic/97803
3、centos各个版本下载:http://vault.centos.org/
http://www.centos.org/modules/tinycontent/index.php?id=30
4. RPM包下载:http://rpmfind.net/linux/rpm2html/search.php?query=unixODBC-devel&submit=Search+...&system=centos&arch=