單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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

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One of the limitations of foam as an extinguishing agent is that foam（）.

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

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