埋地硬聚氯乙烯给水管道工程技术规程(附条文说明)埋地硬聚氯乙烯给水管道工程技术规程(附条文说明)Technical specification for buried unplasticized polyvinyl chloride(PVC-U)pipeline of water supply engineering
建筑排水中空壁消音硬聚氯乙烯管管道工程技术规程(附条文说明)
Technical specification for unplasticized polyvinyl chloride double-wall noise-reducing pipeline engineering of water sewerage in buildings