單項選擇題A fire of escaping liquefied flammable gas is best extinguished by（）.

A.cooling the gas below the ignition point
B.cutting off the supply of oxygen
C.stopping the flow of gas
D.interrupting the chain reaction


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1.單項選擇題A fire starts on you vessel while refueling. You should first（）.

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

2.單項選擇題A flame screen（）.

A.permit the passage of vapor but not of flame
B.prevents the passage of flammable vapors
C.prevents inert gas from leaving a tank
D.permits vapors to exit but not enter a tank

3.單項選擇題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

4.單項選擇題A foam-type portable fire extinguisher would be most useful in combating a fire in（）.

A.soild materials such as wood or bales of fiber
B.flammable liquids
C.a piece of electrical equipment
D.combustible metallic solids

5.單項選擇題A galley grease fire on the stove may be extinguished using（）.

A.water
B.foam
C.the range hood extinguishing system
D.fire dampers