单项选择题

When an oil fire has been extinguished, the surface of the oil should be kept covered with foam to prevent （）.

A.air from contacting the oil vapors
B.permitting re-ignition boiling of the heated oil
C.spontaneous combustion below the oil surface
D.toxic fumes from escaping to the surface

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单项选择题

The process that occurs when heat is generated by a chemical reaction within a substance and continues to a point of ignition is known as （）.

A.chemical ignition
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A vessel sailing through the specific special areas may discharge or dispose of （）.

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In order to find out which lifeboat you are assigned, you should look at the （）.

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