单选题Operation of the valve control release on a fixed CO2 system must immediately（）.Arelease CO2 to the protected spaceBsecure all mechanical ventilation in the protected spaceCsound the rig's general alarm signal for a fireDsound an alarm in the ballast control room
单选题
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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