单项选择题

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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单项选择题

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

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The term "discharge", as it applies to the pollution regulations, means（）.

A.spilling
B.leaking
C.dumping
D.All of the above

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To prevent the spread of fire by convection you should （）.

A.remove combustibiles from direct exposure
B.cool the bulkhead around the fire
C.close all openings to the area
D.shut off electrical power