A.增加過(guò)急 B.增加過(guò)慢 C.降低過(guò)快 D.降低過(guò)慢
A.給水閥 B.主汽閥 C.排污閥 D.疏水閥
A.0.5m1n B.1m1n C.1.5m1n D.2m1n