In the fire main system, quick cleaning strainers are located at the（）.

A.In crews accommodation spaces
B.On the navigating bridge
C.In the engine room
D.All of the above

A.remove oxygen from the area
B.smother fire with foam
C.smother fire with CO₂
D.cool fuel below ignition temperature

A.low-velocity fog
B.high-velocity fog
C.a straight stream of water
D.foam spray