内部管道 meaning in English
internal duct
Examples
- Standard specification for mechanical couplings used on polyethylene conduit , duct and innerduct
机械连接件用聚乙烯导管,排泄管和内部管道的标准规范 - Standard specification for cured - in - place pipe lining system for rehabilitation of metallic gas pipe
金属输气管道复原用硫化固定内部管道系统的标准规范