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

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

出自：海船船员证

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