单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

A.increase its quality
B.obtain complete burning
C.reduce its weight
D.all of the above