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
B.secure all mechanical ventilation in the protected space
C.sound the rig's general alarm signal for a fire
D.sound an alarm in the ballast control room

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热门试题

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
D.conducts electricity

单项选择题

One disadvantage of using regular dry chemical (sodium bicarbonate) in firefighting is that（）.

A.it can break down under high heat and emit noxious fumes
B.it will decompose under prolonged storage and lose its effectiveness
C.fire has been known to flash back over the surface of an oil fire
D.it is ineffective in fighting fires in high-voltage electrical equipment

Operation of the valve control release on a fixed CO2 system must immediately（）.

Operation of the valve control release on a fixed CO₂ system must immediately（）.