telephone trunk line电话主线
telephone network line电话网线
Telephone main line电话主线
telephone e line电话线
telephone party line同线电话
telephone-line concentrator电话线集中器;电话线路集线器
Telephone off line电话断线
an engaged telephone-line占用着的电话线
Special telephone-line service专线服务
To fully adopt the advantage of the availability of telephone in countrywide,a remote reading system of electricity based on telephone line in rural area is designed.
充分利用全国电话村村通的有利条件,设计了一种基于电话线的农村用电远程抄表系统。
参考来源 - 基于电话线的农村用户电能表远程抄表系统