GB/T 18477.3-2019埋地排水用硬聚氯乙烯(PVC-U)结构壁管道系统第3部分:轴向中空壁管材国家标准
英文:Unplasticized polyvinyl chloride (PVC-U) structure wall pipeline system for underground soil waste and drainage—Part ...
英文:Unplasticized polyvinyl chloride (PVC-U) structure wall pipeline system for underground soil waste and drainage—Part ...