how to get the best speed sources?

[kissfire]

hellow everyone!
is there any command for apt-get to get the best speed sources?
i got some sources in my /etc/apt/sources.list,but when i install some soft,it down the soft in a slow speed. so i want to know that:

1.is there an command to get out the best speed source in the sources.list?
2.how dose the apt work? apt down a soft from the firest source which has the soft or the one which has the soft and the best speed?

thanks!

[stlxv]

just try for many times

[syoleen]

The following is my sources.list
I am accessing internet via Beijing NetComm

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# 台湾省台湾大学更新服务器
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-updates main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-updates main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-backports main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-backports main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-security main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-security main restricted universe multiverse
deb cdrom:[Ubuntu 6.06.1 _Dapper Drake_ - Release i386 (20060806.1)]/ dapper main restricted
deb http://archive.ubuntu.com/ubuntu/ dapper main restricted
# deb http://flomertens.keo.in/ubuntu/ dapper main
# deb-src http://flomertens.keo.in/ubuntu/ dapper main
# 亚特兰大Linux爱好者FTP服务器
deb http://ftp.ale.org/pub/mirrors/ubuntu/ dapper main restricted universe multiverse
deb http://ftp.ale.org/pub/mirrors/ubuntu/ dapper-security main restricted universe multiverse
deb http://ftp.ale.org/pub/mirrors/ubuntu/ dapper-updates main restricted universe multiverse
deb http://ftp.ale.org/pub/mirrors/ubuntu/ dapper-backports main restricted universe multiverse
# 台湾新竹县教育研究发展暨网路中心APT服务器
deb http://apt.nc.hcc.edu.tw/pub/ubuntu/ dapper main restricted universe multiverse
deb http://apt.nc.hcc.edu.tw/pub/ubuntu/ dapper-security main restricted universe multiverse
deb http://apt.nc.hcc.edu.tw/pub/ubuntu/ dapper-updates main restricted universe multiverse
deb http://apt.nc.hcc.edu.tw/pub/ubuntu/ dapper-backports main restricted universe multiverse

[eexpress]

一个一个ping就是了。看ping的结果。