A.the outlet of oil
B.the outlet of water
C.the bowl periphery
D.the center of bowl
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A.bowl periphery
B.bowl center
C.upper surface
D.lower surface
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
A.oil
B.sea water
C.air
D.fresh water
A.half the engine rotational speed
B.twice the engine rotational speed
C.the engine rotational speed
D.four times the engine rotational speed
A.increase its quality
B.obtain complete burning
C.reduce its weight
D.all of the above
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White smoke exhausting from an operating diesel engine may indicate （）.
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