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
单项选择题 A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）
单项选择题 Dirt lodged on the nozzle valve seat of a fuel injection nozzle will cause（）
单项选择题 Diesel engine cylinder head test cocks are used to （）
