Plastics piping systems for soil and waste discharge (low and high temperature) within the building structure - Polypropylene (PP) - Part 2: Guidance for the assessment of conformity; German version ENV 1451-2:2001
建筑结构内土壤和废物排放(低温和高温)用塑料管道系统.聚丙烯(PP).第2部分:合格评定指南;德文版ENV 1451-2:2001