單項選擇題

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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單項選擇題

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

單項選擇題

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

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