單項(xiàng)選擇題

When using carbon dioxide to fight a fire on a bulkhead，the CO₂ should be applied（）.

A.first to the bottom of the flaming area，sweeping from side to side，and following the flames upward
B.in a circular motion from the middle of the bulkhead outward
C.to the top of the flaming area，sweeping from side to side，and working toward the bottom
D.in an up-and-down motion from one side of the bulkhead to the other

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單項(xiàng)選擇題

When using a high-velocity fog stream in a passageway，the possibility of a blow back must be guarded against. Blow back is most likely to occur when（）.

A.pressure builds up in the nozzle which causes a surge of water
B.the only opening in a passageway is the one from which the nozzle is being advanced
C.pressure in the fire hose drops below 100 psi
D.a bulkhead collapses due to heat and pressure

單項(xiàng)選擇題

When used to fight fire，carbon dioxide（）.

A.is effective if used promptly on an oil fire
B.has a greater cooling effect than water
C.is lighter than air
D.is harmless to cargo and crew

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When using carbon dioxide to fight a fire on a bulkhead，the CO2 should be applied（）.

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When using a high-velocity fog stream in a passageway，the possibility of a blow back must be guarded against. Blow back is most likely to occur when（）.

When used to fight fire，carbon dioxide（）.

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When using carbon dioxide to fight a fire on a bulkhead，the CO₂ should be applied（）.

When using a high-velocity fog stream in a passageway，the possibility of a blow back must be guarded against. Blow back is most likely to occur when（）.

When used to fight fire，carbon dioxide（）.