单项选择题
Fire extinguishers used on ship’s are numbered by size I through V，with I being（）.
A.used for electrical fires only B.the smallest C.the most accessible D.the most effective
单项选择题 Fire dampers prevent the spread of fire by（）.
单项选择题 Fighting a rig fire in the ballast pumproom with hoses would adversely affect the stability of the rig most by（）.
单项选择题 Fighting a rig fire in a watertight compartment with hoses could reduce the stability of the rig by（）.
