单项选择题
Overhauling a fire in the living quarters on a vessel must include（）.
A.opening dead spaces to check for heat or fire B.evacuation of the vessel C.sounding the all clear signal D.operation of the emergency generator
单项选择题 Operation of the valve control release on a fixed CO2 system must immediately（）.
单项选择题 One of the limitations of foam as an extinguishing agent is that foam（）.
单项选择题 One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that（）.
