单项选择题
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
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A fire hose with a nozzle attached must be connected to each hydrant except when exposed to heavy weather or when the（）.
A.fire hose might be damaged by cargo operations
B.vessel is in port
C.fire-main system is not charged
D.fire pumps are used for purposes other than supplying water to the fire main -
单项选择题
If you are fighting a fire below the main deck of your vessel，which action is most important concerning the stability of the vessel?（）.
A.Shutting off electricity to damaged cables
B.Pumping fire-fighting water overboard
C.Maneuvering the vessel so the fire is on the lee side
D.Removing burned debris from the cargo hold -
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It is necessary to secure the forced ventilation to a compartment where there is a fire to（）.
A.allow the exhaust fans to remove smoke
B.extinguish the fire by carbon monoxide smothering
C.prevent additional oxygen from reaching the fire
D.protect fire fighting personnel from smoke
