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單項選擇題

Be sure to make the engine turn by （） before starting and after stopping .

A.steering gear
B.turning gear
C.steering wheel
D.turning cycle

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單項選擇題

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

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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