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單項選擇題

The lube oil to lubricate the surfaces of the cylinder liners is spread over by the （）.

A.sliding piston rings
B.engines camshaft
C.small pumps
D.forced feed system

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單項選擇題

The most important factor that causes the wear of the engine parts is （）.

A.excessive heat
B.friction
C.oxidation
D.high pressure

單項選擇題

In the closed cooling system, the water （）.

A.is made to circulate out of the system
B.is made to circulate within the system
C.is made circulate within the system
D.is made circulate out of the system