单项选择题
A.prolonged maintenance intervals B.improved atomization C.greater fuel economy D.incomplete combustion
The relative air pressure in the inlet manifold of a tu...
单项选择题The relative air pressure in the inlet manifold of a turbocharged diesel engine is usually（）
A.greater than the average exhaust manifold pressure B.less than the average exhaust manifold pressure C.greater at the turbine wheel than at the impeller D.greater at reduced engine speed
A sudden decrease in the diesel engine lube oil viscosi...
单项选择题A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）
A.loss of additives from the lube oil B.carbon deposits in the lube oil C.excessive centrifuging D.excessive fuel dilution
Dirt lodged on the nozzle valve seat of a fuel injectio...
单项选择题Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause（）
A.erosion and cratering of the nozzle orifices B.fuel leakage into the nozzle drain line C.fuel leakage before and after injection D.insufficient fuel delivery though that nozzle
