GB/T 35451.1-2017埋地排水排污用聚丙烯(PP)结构壁管道系统第1部分:聚丙烯双壁波纹管材国家标准
英文:Polypropylene(PP) structure-wall piping systems for underground drainage and sewerage—Part 1:Polypropylene double wal...
英文:Polypropylene(PP) structure-wall piping systems for underground drainage and sewerage—Part 1:Polypropylene double wal...