TR Trunk Relay 中继线中继
trunk relay layer 主干中继层
relay trunk 中继线
trunk connecting relay 中继连接继电器
radio relay trunk service 无线电接力干线通信业务
They receive oil through pipeline gathering systems from production tanks and relay it to trunk line stations.
它们通过管道集油系统从生产罐接受原油，并把它转输到干线泵站。
Optical Receiver; CATV products; optical Transmitter; trunk Amplifier; Subscriber Amplifier; Spliter; Taps; Optical Relay;
光纤放大器； 光接收机； 光发射机； 分配器；
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