Plastics piping systems for non-pressure underground drainage and sewerage - Unplasticized poly(vinyl chloride) (PVC-U) - Part 2: Guidance for assessment of conformity; German version ENV 1401-2:2000
无压地下排水和污水用塑料管道系统.未增塑聚氯乙烯(PVC-U).第2部分:合格评定指南;德文版ENV 1401-2:2000