单项选择题
A.high compression pressure B.low intake air temperature C.low exhaust pressure D.high scavenge air pressure
High firing pressures and a low exhaust temperature in ...
单项选择题High firing pressures and a low exhaust temperature in a diesel engine may result from （）.
A.decreased piston to cylinder head clearance B.increased exhaust system back pressure C.early fuel injection timing D.low scavenge air temperature
Whether using a centrifuge or a simple filter, oil clea...
单项选择题Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a （）.
A.high temperature and a high viscosity B.high temperature and a low viscosity C.low temperature and a high viscosity D.low temperature and a low viscosity
Exhaust valve grooving and corrosion is caused by certa...
单项选择题Exhaust valve grooving and corrosion is caused by certain components of residual fuel oilThese components are sodium, sulfur, and （）.
A.vanadium B.carbon C.copper D.ash
