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
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 （）
单项选择题 Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?（）
