Draft Document - Plastics piping systems for underground drainage and sewerage under pressure - Unplasticized poly(vinyl chloride) (PVC-U) - Part 7: Assessment of conformity; German version prEN 1456-7:1996
文件草案.承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7部分:合格评定;德文版prEN 1456-7:1996