GD-7018 series optical fiber pipeline identifier tuaj yeem txheeb xyuas qhov tseeb thiab ntsuas qhov tob ntawm cov kav dej hauv av, cables thiab optical cables nyob rau hauv qhov xwm txheej tsis khawb, thiab pom tseeb qhov kev puas tsuaj ntawm txheej txheej ntawm cov kav dej hauv av thiab qhov chaw. underground cable txhaum cov ntsiab lus.