Composite stainless steel tube optical fiber unit, PDPE inner sheath, medium carbon steel wire armour, Ditumen coating, polypropylene yarn wrapping covering.
不锈钢管光纤单元，聚乙烯绝缘内护套，钢丝铠装，沥青浇灌，聚丙烯绳外被。
Composite stainless steel tube optical fiber unit, PDPE inner sheath, medium carbon steel wire armour, Ditumen coating, polypropylene yarn wrapping covering.
不锈钢管光纤单元，聚乙烯绝缘内护套，钢丝铠装，沥青浇灌，聚丙烯绳外被。
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