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單項(xiàng)選擇題

In a purifier changing to a gravity disc with larger hole diameter will move the interface towards the （）.

A.bowl periphery
B.bowl center
C.upper surface
D.lower surface

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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

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