GB/T 19473.5-2020冷热水用聚丁烯(PB)管道系统第5部分:系统适用性标准
英文:Polybutene (PB) piping systems for hot and cold water installations—Part 5: Fitness for purpose of the system GB/T 19...
英文:Polybutene (PB) piping systems for hot and cold water installations—Part 5: Fitness for purpose of the system GB/T 19...