单项选择题
A.6 B.2 C.12 D.8
As the plunger moves up, the ports are closed and the f...
单项选择题As the plunger moves up, the ports are closed and the fuel （） and delivered to the injector nozzle at very high pressure.
A.being compressed B.to be pumped up C.is pressurized D.are built up
As for a diesel engine, lack of combustion air may be d...
单项选择题As for a diesel engine, lack of combustion air may be due to （）.
A.fouling turbine B.fuel pump faults C.lubrication failure D.excessive cooling
As a heat engine,（） energy is the source of power by wh...
单项选择题As a heat engine,（） energy is the source of power by which the diesel engine can be operated.
A.electric B.heat C.mechanical D.exhaust
