单项选择题

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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单项选择题

A.immediately above the level of the oil
B.at the top of the tank
C.in the vent riser
D.one meter from the deck

单项选择题

A.fuel tanks
B.spark plugs
C.carburetors
D.distributors

单项选择题

A.remotely operated valves
B.fusible links
C.C0₂ system pressure switches
D.heat or smoke detectors

Before using a fixed CO2 system to fight an engine room fire，you must（）.