单项选择题

A foam-type portable fire extinguisher is most useful in fighting a fire in（）.

A.generators
B.oil drums
C.the bridge controls
D.combustible metals

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单项选择题

A.two or more releasing stations
B.automatic release in event of a fire
C.an audible alarm and time delay
D.an audible and visible alarm

单项选择题

A.stop the ventilation
B.sound the general alarm
C.determine the source of the fire
D.attempt to extinguish the fire

单项选择题

A.low-velocity fog only
B.a solid stream only
C.a solid stream and foam
D.a solid stream and fog