单项选择题
If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）
A.early injection timing B.worn orifices in the injection nozzles C.worn or scored cylinder liners D.using a fuel with too low of a cetane number
单项选择题 Scavenging in a turbocharged, four-stroke/cycle diesel engine is accomplished（）
单项选择题 A diesel engine piston crown can crack from （）
单项选择题 Fuel oil contamination of an auxiliary diesel engine lube oil can result in（）
