单项选择题
On a cargo vessel, fire and boat drills must be held within 24 hours of leaving port if the percentage of the crew replaced is more than （）.
A.5%
B.10%
C.25%
D.40%
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A.Fuel oil
B.Wood
C.Celluloid
D.Electrical insulation -
单项选择题
Except in rare cases, it is impossible to extinguish a shipboard fire by （）.
A.removing the heat
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A class "C" fire is burning （）.
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