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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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Diesel engines have more advantages in comparison with gasoline enginesB
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Gasoline engines have more advantages in comparison with diesel enginesD
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The direction of pressure on the journal in four-stroke engine is continuouslyB
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four-stroke engines usually utilize a heavier grade of oil than tow-stroke enginesD
Low-stroke engines usually consume less lube oil than four-stroke engines
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单选题The cetane number rates fuels for diesel engines according to its （）A
antiknock characteristicsB
ignition qualitiesC
rates of vaporizationD
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start engines immediatelyC
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increase the air charge velocityC
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单选题Exhaust pipes for separate diesel engines can be combined only when （）A
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
fuel injector
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Between；more commonlyB
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sealing compoundC
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单选题All diesel engines are classified as（）.A
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单选题The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the （）A
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cooling systemC
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