私用电路数字数据服务
private circuit digital data service
PCDDs
国际私用租用电路
international private leased circuit
私用电话网络
private telephone network
私用电子交换
private electronic exchange
PEX
厂用电电压
service voltage
auxiliary power supply voltage
service power voltage
厂用电电压等级选择
Selection of Auxiliary Power Voltage Grade
厂用电电源
high voltage auxiliary power
风力发电用电缆
cable for wind power generation
风能发电用电缆
cables for wind power generation
高可靠大功率专用电路
High reliable and power special circuit
公用电路交换数据网
Circuit Switched Public Data Network CSPDN
国际租用电路业务
international leased circuit service