国产精品高清久久久久久久,黄色片看,八戒八戒影院,欧美精品一区二区三区在线播放,天堂素人在线,天堂网在线视频,久久亚洲精品国产精品婷婷

In the process of twisted-pair construction, does the twisted-pair run through the same pipe as the power line?

release:admin Browse:3227 times

Is not, because the power line in the power at the same time will produce high level electromagnetic interference, will have an impact on the twisted-pair transmission signal.