单项选择题
A.prevent piston ring wear B.shorten the ring break-in period C.prevent cylinder liner glazing D.appear slick and glazed
A diesel engine is supercharged in order to（）A.lower th...
单项选择题A diesel engine is supercharged in order to（）
A.lower the no-load RPMs B.provide more air for combine with the fuel C.increase the no-load RPMs D.provide more fuel combine with the air
Distortion of the spray pattern of a nozzle or injector...
单项选择题Distortion of the spray pattern of a nozzle or injector may be indicated by a/an（）
A.high firing pressure B.overload of that particular cylinder C.smoky exhaust D.cooling water temperature rise
The rate of pressure rise during the period following f...
单项选择题The rate of pressure rise during the period following fuel ignition in a diesel will result in （）
A.valve overlap B.volumetric efficiency C.turbulence of the air change D.fuel efficiency
