單項(xiàng)選擇題At least （） cylinders in four-stroke engine will be configured to ensure that the engine can be started with the crankshaft at whatever position.

A.6
B.2
C.12
D.8


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1.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

2.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

3.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

4.單項(xiàng)選擇題An overspeed safety device is usually fitted to a generator engine for （） in the event of overspeed.

A.cutting power off the engine
B.increasing the fuel pump setting
C.braking the crankshaft
D.stabilizing the ship speed