單項選擇題In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.

A.additives
B.water
C.grease
D.acid solution


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1.單項選擇題In a typical fuel system, the oil is stored in （） in the double bottom.

A.setting tanks
B.service tanks
C.tanks
D.drain tanks

2.單項選擇題In a typical fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.

A.a service tank
B.a collecting tank
C.a sump
D.a settling tank

3.單項選擇題In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.

A.the outlet of oil
B.the outlet of water
C.the bowl periphery
D.the center of bowl

4.單項選擇題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

5.單項選擇題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