单项选择题
A.fuel injectors B.exhaust valves C.intake valves D.all of the above
A two-stroke diesel engine exhaust temperature will be ...
A two-stroke diesel engine exhaust temperature will be lower than a four-stroke diesel engine of the same displacement because the （） (1) scavenging air is cooling the exhaust gases (2) exhaust cycle time is longer
A.(1) only B.(2) only C.both (1) and (2) D.neither (1) nor (2)
If the chemical analysis of a lube oil sample taken fro...
单项选择题If the chemical analysis of a lube oil sample taken from a diesel engine indicates an increased neutralization number, the （）.
A.acidity has increased B.viscosity has decreased C.demulsibility has improved D.foaming is guaranteed to occur
When an auxiliary boiler is panting and emitting black ...
单项选择题When an auxiliary boiler is panting and emitting black smoke, you should （）.
A.increase the fuel oil temperature B.decrease the fuel oil temperature C.decrease the fuel oil supply pressure D.increase the air supply
