Before using a fixed CO2 system to fight an engine room fire，you must（）. A:secure the engine room ventilation B:secure the machinery in the engine room C:evacuate all engine room personnel D:All of the above

Before using a fixed CO₂ system to fight an engine room fire，you must（）.
A:secure the engine room ventilation
B:secure the machinery in the engine room
C:evacuate all engine room personnel
D:All of the above

出自：海船船员证

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