GB 30717-2019蹲便器水效限定值及水效等级标准
英文:Minimum allowable values of water efficiency and water efficiency grades for squatting pans GB 30717-2019介绍: 国家标准《蹲便器...
英文:Minimum allowable values of water efficiency and water efficiency grades for squatting pans GB 30717-2019介绍: 国家标准《蹲便器...