17，继往开来

http://www.virscan.org/         ###世界杀毒网

http://www.freebuf.com/         ###极客安全

https://pkgs.org/                         ###rpm

http://rpmfind.net/                      ###rpm

http://man.linuxde.net/                                    ###Linux命令

http://mirrors.aliyun.com/                               ###阿里云

https://mirrors.tuna.tsinghua.edu.cn                ###清华

http://mirrors.ustc.edu.cn/                              ###中科大

Linux学习必备