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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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出自：海船船员证

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