单项选择题
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
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 （）.
单项选择题 In a four-stroke engines the camshaft rotates at （）.
单项选择题 In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.