?NORM EN 13476-1:2019现行
Plastics 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 1:General requirements and performance characteristic
出版：Osterreichisches Normungsinstitut/Austrian Standards
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