陕西电信西安小寨局20000门程控交换机开通工程。
电话交换系统
telephone switching system
暂无补充释义。
相关例句
相关词条
telephone ringer
speech-amplifying mutually talking telephone
fire reporting telephone【安全】 通信;fire telephone【安全】 通信
telephone answering machine
SPC telephone exchange
computerassisted telephone interviewing
computerized telephone
longitudinal-crossbar auto-telephone exchange