A high-velocity fog stream can be used in fire fighting situations to drive heat and smoke ahead of the fire fighters in a passageway. This technique should only be used when（）.<br>A:using a 2-1/2 inch hose<br>B:there is an outlet for the smoke and heat<br>C:the fire is totally contained by the ship's structure<br>D:at least two fog streams can be used

A high-velocity fog stream can be used in fire fighting situations to drive heat and smoke ahead of the fire fighters in a passageway. This technique should only be used when（）.
A:using a 2-1/2 inch hose
B:there is an outlet for the smoke and heat
C:the fire is totally contained by the ship's structure
D:at least two fog streams can be used

出自：海船船员证

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