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單項(xiàng)選擇題

The rising of the exhaust temperature in manifold pipe may NOT result from （）.

A.too great a loading
B.fouled turbocharger
C.bad combustion
D.excessive air

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單項(xiàng)選擇題

The rim of the piston may contain cut-out portions to accommodate （） when they open.

A.the gases
B.the air
C.the valves
D.the injectors

單項(xiàng)選擇題

The removal of （） from lubricating oil will reduce engine wear and possible breakdowns.

A.contaminating water
B.contaminated additives
C.contaminated fuel
D.contaminating impurities

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