单项选择题
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
Which of the following problems may occur if the openin...
单项选择题Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?()
A.The amount of fuel injected will be increased B.The start of injection will be retarded C.The nozzle will permit fuel to dribble D.The spray pattern will be distorted