GB/T 19473.3-2020冷热水用聚丁烯(PB)管道系统第3部分:管件标准
英文:Polybutene (PB) piping systems for hot and cold water installations—Part 3: Fittings GB/T 19473.3-2020介绍: 国家标准《冷热水用聚丁...
英文:Polybutene (PB) piping systems for hot and cold water installations—Part 3: Fittings GB/T 19473.3-2020介绍: 国家标准《冷热水用聚丁...