A.水流指示器 B.壓力開關(guān) C.末端試水裝置 D.水力警鈴
A.10L/s B.15L/s C.20L/s D.25L/s
A.小于2L/(s·m) B.大于2L/(s·m) C.小于3L/(s·m) D.大于3L/(s·m)