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单选题
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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gives off large amount of heatC
gives up large amount of steamD
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a service tankB
a collecting tankC
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the vapor and air mixture is too richB
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the vapor is too little compared to the airD
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单选题If a fire ignites in the engine room as a result of a high pressure fuel oil leak, you should FIRST （）.A
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单选题If a tow-stroke/diesel engine is over-speeding due to leakage of lube oil into the cylinders, what should you do to stop the engine?（）A
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单选题Obviously, for a given fuel oil, its pour point is （） its cloud point.A
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the exhaust valveB
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flattening of the bowl neoprene O-ringsB
operation within the explosive rang of the fuelC
excessive purifier operating pressuresD
excessive oil viscosity
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单选题The rate of expansion of heated fuel oil varies with the （）.A
conductivityB
viscosityC
volumeD
specific gravity
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单选题The vapors given off by heated fuel oil are heavier than air and are（）.A
odorlessB
explosiveC
nontoxicD
visible
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