单项选择题
In the event of a fire, the doors to a stair tower must be closed to prevent the spread of fire by （）.
A.convection
B.conduction
C.radiation
D.ventilation
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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 -
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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单项选择题
A vessel sailing through the specific special areas may discharge or dispose of （）.
A.incinerated ash at anytime
B.fairly dense material that will sink, i√emetal cans or glass bottles at anytime
C.victual waste when at least 12 nautical miles from shore
D.absolutely no garbage at anytime
