單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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