单选题Before using a fixed CO2 system to fight an engine room fire，you must（）.Asecure the engine room ventilationBsecure the machinery in the engine roomCevacuate all engine room personnelDAll of the above
单选题
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
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