GB/T 18477.3-2019
ActiveUnplasticized polyvinyl chloride (PVC-U) structure wall pipeline system for underground soil waste and drainage—Part 3: Axial hollow-wall construction pipes
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
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