单项选择题
A.Non-harmonic speed
B.Critical speed
C.Maximum speed
D.Design maximum speed
单项选择题 A dirty fuel oil filter is can be detected by （） Ⅰ.fuel oil analysis Ⅱ.observing the pressure drop across the filter
单项选择题 The function of the after-cooler installed between the turbocharger and intake manifold on some diesel engine, is to （）
单项选择题 High lube oil temperatures developing in a diesel engine can result from（）