GB/T 18742.1-2017冷热水用聚丙烯管道系统第1部分:总则国家标准
英文:Polypropylene (PP) piping systems for hot and cold water installations—Part 1: General GB/T 18742.1-2017介绍: 国家标准《冷热水用...
英文:Polypropylene (PP) piping systems for hot and cold water installations—Part 1: General GB/T 18742.1-2017介绍: 国家标准《冷热水用...