单项选择题
A.higher torque but lower brake horsepower B.lower torque but higher brake horsepower C.higher torque and lower brake horsepower D.lower torque and higher brake horsepower
Lubricating oil used in a diesel engine serves to（）A.re...
单项选择题Lubricating oil used in a diesel engine serves to（）
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
