单项选择题
Throw a （）to the person overboard and help him come on board.
A.lifeboat B.life-raft C.lifebuoy D.fire mask
单项选择题 （）extinguish oil and electrical fires with water.
单项选择题 （） fire doors, windows, hatches, accesses and ventilators.
单项选择题 Inform the bridge and give the alarm at once （）the fire.
