通讯网络覆盖全县，开通了程控电话、移动电话和小灵通无线电话。

Communication network covering the whole county, opened a program-controlled telephones, mobile phones and PHS mobile phones.

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。

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PT C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.

CK系列船用程控电话系统是为大、中、小型舰船提供整船内部电话服务的设备。

CK series Marine automatic telephone system is application for all kinds of vessels; It support automatic exchange service for auto telephone.