单项选择题

The use of sinking and dispersing agents for the removal of surface oil is （）.

A.the most common method used in the United States
B.too expensive for common use
C.generally safe to sea life
D.generally harmful to sea life

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单项选择题

One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is （）.

A.the "snow" which is sometimes discharged along with the gas is toxic
B.prolonged exposure to high concentrations of C0₂gas causes suffocation
C.rapid dissipation of the C0₂ vapor
D.the C0₂ gas is lighter than air and a large amount is required to extinguisha fire near the deck

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A fire involving aluminum powder would be a class （）.

A."A" fire
B."B" fire
C."C" fire
D."D" fire

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Which of the following components provides a direct source of seawater for the fire main system?（）

A.Rose box
B.Sea chest or spool piece
C.Sluice valve
D.Fire pump stuffing box