The FIRST course of action in fighting a fire in a cargo or fuel oil tank is to （）. A:secure all openings to the tank B:discharge an initial charge of CO2 with a hand portable extinguisher C:direct a fire hose into the tank and energize the fire main D:spray the tank boundaries with a fire hose to promote cooling

The FIRST course of action in fighting a fire in a cargo or fuel oil tank is to （）.
A:secure all openings to the tank
B:discharge an initial charge of CO₂with a hand portable extinguisher
C:direct a fire hose into the tank and energize the fire main
D:spray the tank boundaries with a fire hose to promote cooling

出自：海船船员证

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