Design for the connection of discharge branch with horizontal trunk main in building drainage system and material selection 建筑排水支管与横干管的连接设计与选材
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Water samples are taken regularly throughout the entire supply and distribution system . the sampling points include water treatment works , service reservoirs , trunk mains , connection points and domestic taps . the data from these samples are checked against the world health organization s guidelines for drinking - water quality , which were developed by experts from around the world 在整个供水及输水系统中，有关人员经常从滤水厂、配水库、输水干管、供水接驳位置和用户水头抽取样本进行化验，鉴定化验数据所显示的水质是否符合世界?生组织所订定的饮用食水水质准则。
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