單項(xiàng)選擇題

At the top of the A-frames there is a strong cast iron frame called （）.

A.cylinder liner
B.cylinder cover
C.the gear box
D.the scavenging box

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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

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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