Graphical symbols for diagrams - part 10 : telecommunications ; transmission iec 60617 - 10 : 1996 ; german version en 60617 - 10 : 1996 线图图形符号.第10部分:电信线路图.发射设备
Difficulty of inquiring , managing and maintaining telecommunication network resource is the hot problem in the present 电信线路资源的查询难、管理难和维护难成为当前的热点问题。
Graphical symbols for diagrams - part 9 : telecommunications ; switching and peripheral equipment iec 60617 - 9 : 1996 ; german version en 60617 - 9 : 1996 线图图形符号.第9部分:电信线路图.中继设备和终端设
British telecom linkline service in england where the caller is not charged for the call . similar to the north american 800 in - wats service 英格兰的一种不列颠电信线路服务。用户可以免费呼叫。类似于北美的800in - wats服务。
A british telecom linkline service in england where the caller is not charged for the call . similar to the north american 800 in - wats service 英格兰的一种不列颠电信线路服务。用户可以免费呼叫。类似于北美的800in - wats服务。
In 1869 , japan s first telecommunications line was opened between tokyo and yokohama , and the first steam locomotive started running in 1872 from shimbashi to yokohama 1869年，日本在东京和横滨之间开通了第一条电信线路， 1872年第一辆蒸汽机车开始在新桥到横滨之间运行。
