PTC element as over-current limiter for program-controlled telephone exchanger is one of the important application of PTC ceramic material.
程控电话交换机过电流保护元件要求用低电阻率高性能的PTC陶瓷材料来制备。
High performance PTC ceramic material with low resistivity is desired to prepare an over-current limiter for program-controlled telephone exchanger.
程控电话交换机过电流保护元件要求用低电阻率高性能的PT C陶瓷材料来制备。
Postal and telecommunications to achieve the program-controlled exchange, digital transmission will take the lead in the province completed the first telephone counties.
邮电通讯实现了交换程控化，传输数字化，并率先在全省建成了第一个电话县。
This paper analyses all factors that influence the telephone connection of program-controlled customer exchangers and puts forward measures for raising the telephone connection rate.
分析了影响程控用户交换机电话接通率的各种因素，并结合实际情况指出提高电话接通率的具体措施。
The telephone network based on circuit-switching and digital program controlled exchanging technology plays an important role in the whole communicating networks.
以电路交换和数字程控交换技术为基础的电话网更是在整个通信网中占据着重要的地位。
The telephone is used with the explosion-proof coupling of HOB-1 and connect to program controlled switch to form explosion-proof communication system.
话机与关联设备HOB-1型防爆耦合器配套， ● 户内、户外 与交换机连接，组成防爆电话通讯系统。
The telephone is used with the explosion-proof coupling of HOB-1 and connect to program controlled switch to form explosion-proof communication system.
话机与关联设备HOB-1型防爆耦合器配套， ● 户内、户外 与交换机连接，组成防爆电话通讯系统。
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