单项选择题
Portable CO2 fire extinguishers should NOT be used to inert a space containing flammable liquids due to the danger of（）.
A.the CO2 being inhaled by personnel
B.reflash of burning liquids
C.vapor condensation on the extinguisher
D.the discharge causing a static spark
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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（）.
A.release CO2 to the protected space
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单项选择题
One of the limitations of foam as an extinguishing agent is that foam（）.
A.cannot be made with salt water
B.is heavier than oil and sinks below its surface
C.is corrosive and a hazard to fire fighters
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