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trunk main 【電學】中繼干線。

trunk piston

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 在整個供水及輸水系統中,有關人員經常從濾水廠、配水庫、輸水干管、供水接駁位置和用戶水頭抽取樣本進行化驗,鑒定化驗數據所顯示的水質是否符合世界?生組織所訂定的飲用食水水質準則。

Design for the connection of discharge branch with horizontal trunk main in building drainage system and material selection 建筑排水支管與橫干管的連接設計與選材