单项选择题

Poor combustion in a diesel engine can be caused by （）.

A.high compression pressure
B.low intake air temperature
C.low exhaust pressure
D.high scavenge air pressure

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单项选择题

High firing pressures and a low exhaust temperature in a diesel engine may result from （）.

A.decreased piston to cylinder head clearance
B.increased exhaust system back pressure
C.early fuel injection timing
D.low scavenge air temperature

单项选择题

Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a （）.

A.high temperature and a high viscosity
B.high temperature and a low viscosity
C.low temperature and a high viscosity
D.low temperature and a low viscosity