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单选题
The vapors given off by heated fuel oil are heavier than air and are（）.
A
odorless
B
explosive
C
nontoxic
D
visible
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a service tankB
a collecting tankC
a sumpD
a settling tank
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单选题To avoid excessive pressures in the fuel oil filling system during bunkering, you should （）.A
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are nontoxic in all concentrationsC
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are heavier than air
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单选题The vapors given off by heated fuel oil are flammable, explosive, and （）A
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heavier than airC
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单选题The rate of expansion of heated fuel oil varies with the （）.A
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None of the above
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