rural telephone exchange的意思|示意

农村电话交换机 农村电话交换机 rural telephone exchange 程控电话交换机 Digital Telephone Switch Board ; SPC telephone exchange ; NEC ; program-controlled telephone exchanger ..

农村电话局 农村电话局 rural telephone exchange 农村电气化 rural electrification; farm electrification; electrification of the countryside ..