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单选题
Diesel engines are considered safer than gasoline engines because（）.
A
they are more heavily built
B
the fuel used is less volatile
C
they can be easily reversed
D
they operate at a lower speed
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ignition qualitiesC
rates of vaporizationD
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space limitations prevent separately run pipesB
the engines are small auxiliary unitsC
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lube oilB
fuel oilC
turbine oilD
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turbochargerC
fuel atomizerD
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