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單項(xiàng)選擇題

In a marine diesel engine the oil sump is （）.

A.just below the crankcase
B.the oil cup for the exhaust valve
C.the pan for collecting drain fuel oil
D.oil circulating pump

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單項(xiàng)選擇題

In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any leak in the cooler will mean a loss of （）.

A.oil
B.sea water
C.air
D.fresh water

單項(xiàng)選擇題

In a four-stroke engines the camshaft rotates at （）.

A.half the engine rotational speed
B.twice the engine rotational speed
C.the engine rotational speed
D.four times the engine rotational speed

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