The type of extinguisher which should be used for an electricity fire is（）.

单项选择题The supply of carbon dioxide used in the fixed extinguishing system aboard a cargo vessel MUST be at least sufficient for（）.

A.all the spaces of a vessel
B.all cargo spaces
C.the engine room and largest cargo space
D.the space requiring the largest amount

单项选择题The success of an indirect attack on a fire depends on the（）.

A.size of the fire when initially observed
B.complete containment of the fire
C.cooling ability of the firefighting agent
D.class of the fire

单项选择题The straight stream capability of an all-purpose nozzle is used in fighting a class A fire to（）.

A.shield fire fighters from radiant heat
B.break up burning material
C.get the most water possible on the fire
D.drive heat and smoke ahead of the fire fighters

单项选择题The sprinkler system of a survival craft is used to（）.

A.cool the craft in a fire
B.cool the engine
C.spray oil on the sea to calm it
D.spray personnel during a fire

单项选择题The spread of fire is prevented by（）.

A.cooling surfaces adjacent to the fire
B.leaving combustibles in the endangered area
C.increasing the oxygen supply
D.All of the above