單項選擇題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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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題At the required fire drill conducted aboard a vessel，all persons must report to their stations and demonstrate their ability to perform the duties assigned to them（）.

A.by the toolpusher
B.in the station bill
C.by the person conducting the drill
D.at the previous safety meeting

5.單項選擇題Carbon dioxide as a fire fighting agent has which advantage over other agents?（）.

A.It causes minimal damage
B.It is safer for personnel
C.It is cheaper
D.It is most effective on a per unit basis