单项选择题

When monitoring diesel engine performance, the most useful instrument to use is the （）

A.dwell-tachometer
B.exhaust gas pyrometer
C.fuel flow rate mete
D.exhaust gas analyzer

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单项选择题

A.worn or broken cylinder liner sealing rings
B.high cooling water temperature
C.worn or broken piston rings
D.low fuel oil pressure

单项选择题

A.pyrometer
B.bourdon gauge
C.pneumercator
D.manometer

单项选择题

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