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單項選擇題

An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with（）

A.graphite packing
B.sealing compound
C.lubricating oil
D.gaskets

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單項選擇題
What is the function of the after-cooler installed in the diesel engine air intakes system?（）
A.Decrease the air density
B.Increase the exhaust temperature
C.Decrease the lube oil temperature
D.Increase the air density
單項選擇題
Which harmful consequence may be the result of lube oil sludge accumulation? （）
A.Clogged oil pump suction screens
B.Increased oil operating temperatures
C.Sticking piston rings
D.All of the above