单项选择题
A.bowl periphery B.bowl center C.upper surface D.lower surface
In a marine diesel engine the oil sump is （）.A.just bel...
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
In a general oil cooler circulated by sea water, the oi...
单项选择题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
In a four-stroke engines the camshaft rotates at （）.A.h...
单项选择题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
