单项选择题

A sudden drop in compression pressure in one cylinder of a diesel engine can be caused by（）

A.a leaking fuel injector nozzle
B.a clogged air filter
C.excessively early fuel injection
D.malfunctioning valves

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单项选择题

A.crankcase
B.piston
C.cylinder liner
D.crank cheek

单项选择题

A.discharge exhaust gases and smoke
B.furnish energy to the turbocharger
C.reduce engine room noise
D.all of the above

单项选择题

A.residual carbon deposits
B.lube oil viscosity breakdown
C.uneven heat expansion of the rings
D.uneven heat expansion of the piston