单项选择题
You are about to enter a compartment to investigate a suspected smoldering fireIf youre not wearing a self-contained breathing apparatus, you should test the compartments atmosphere to determine if there is/are （）.
A.sufficient oxygen to sustain human life
B.an explosive mixture in the compartment
C.a toxic atmosphere in the compartment
D.All of the above
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Fire prevention during welding or burning aboard any vessel should include （）.
A.posting a fire watch in the immediate area
B.providing an extinguisher which is ready for immediate use
C.requiring the fire watch to remain on post for 30 minutes after the completion of welding or burning
D.All of the above -
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The vapors given off by heated fuel oil are flammable, explosive, and （）
A.lighter than air
B.heavier than air
C.odorless
D.nontoxic -
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If a small fire initially breaks out in the engine room bilges, in which of the following sequences should the fire extinguishing agents or systems be used?（）
A.Fixed CO2,semi-portable CO2, then hand portable CO2
B.Semi-portable CO2, fixedCO2, then hand portable CO2
C.Hand portable, semi-portable CO2, then as a last resort the fixed CO2 system
D.Hand portable, fixed CO2, then as a last resort the semi-portable CO2
