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單項(xiàng)選擇題

Impurities in the fuel oil will affect the operation of the engine, which has （） the use of separator and some other devices.

A.brought about
B.caused for
C.resulted from
D.led

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單項(xiàng)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

單項(xiàng)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

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