1. power line carrier communication 
   电力线载波通信
2. power transmission line and pipeline survey 
   输电线路和输油管道测量
3. Deliberate interference of a transmission on one carrier by transmission on another approximately equal carrier, with wobble or noise modulation. 
   用波动或噪声调制另一个近似相等的载波传输，人为地干扰一个载波的传输。
4. An electric-power transmission cable. 
   电缆传送电流的导线
5. extra-high voltage power transmission 
   超高压输电

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