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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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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

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