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ABNT NBR ISO 21138-3-2021Plastics piping systems for non-pressure underground drainage and sewerage - Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) Part 3:Pipes and fittings with non

raybet雷电竞电竞app下载地址类别：[ABNT] 巴西国家raybet雷电竞电竞app下载地址
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raybet雷电竞电竞app下载地址编号：ABNT NBR ISO 21138-3-2021
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polypropylene polyethylene underground