单选题In order to release CO2 to the machinery spaces from a fixed fire extinguishing system, you must（）.Aactuate an alarm and open the engine room control valveBactuate an alarm and open the engine room CO2 releasing valveCopen the engine room control valve and shut off engine room ventilation fansDopen the engine room control valve and then the CO2 releasing valve
单选题
In order to release CO2 to the machinery spaces from a fixed fire extinguishing system, you must（）.
A
actuate an alarm and open the engine room control valve
B
actuate an alarm and open the engine room CO2 releasing valve
C
open the engine room control valve and shut off engine room ventilation fans
D
open the engine room control valve and then the CO2 releasing valve
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