低压灌溉用硬聚氯乙烯(PVC-U)管材 Unplasticized poly(vinyl chloride)(PVC-U) pipes for low-pressureconveyance in irrigation GB/T 13664-2023 实施时间: 2024-04-01 (681) [相关检测机构] [相关产品方案](1)