| 标准编号 | ISO/CD 21138-3 |
| 标准名称 | 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 3: Pipes and fittings with non-smooth external surface, Type B |
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