单项选择题
A.reduce the wear of bearing surfaces B.cool the bearing surfaces C.assist in sealing bearing surfaces D.all of the above
Which of the terms listed below represents the operatio...
单项选择题Which of the terms listed below represents the operational speed at which excessive engine vibration is created?（）
A.Non-harmonic speed B.Critical speed C.Maximum speed D.Design maximum speed
A dirty fuel oil filter is can be detected by （） Ⅰ.fuel...
A dirty fuel oil filter is can be detected by （） Ⅰ.fuel oil analysis Ⅱ.observing the pressure drop across the filter
A.Ⅰonly B.Ⅱonly C.eitherⅠorⅡ D.neitherⅠnor
The function of the after-cooler installed between the ...
单项选择题The function of the after-cooler installed between the turbocharger and intake manifold on some diesel engine, is to （）
A.increase the density of the intake air B.decrease turbocharger power usage C.reduce exhaust gas temperature D.compensate for turbocharger PRM fluctuations
