单项选择题
A.Prevent the accumulation of explosive gases
B.Protect the hull from leaking electrolyte
C.Prevent movement of the battery in rough waters
D.Protect against accidental shorting across terminals
单项选择题 The master should（）necessary precautions to prevent accidents or damage.
单项选择题 The injured stevedore paid（）attention to the loading instructions from the chief Officer.
单项选择题 The first the Second Mate knew of the fire was the sounding of the emergency alarm，which had been（）from the engine room.