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單項(xiàng)選擇題

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）

A.Impeller
B.Compressor
C.After-cooler
D.Exhaust differ

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單項(xiàng)選擇題

Lube oil in the fresh water cooling system of a diesel engine may result from a （）

A.camshaft seizure
B.lube oil pump failure
C.lube oil cooler failure
D.lube oil pump overflow

單項(xiàng)選擇題

Which of the following problems is the main source of fuel pump and injection system malfunctions?（）

A.Improper lubrication
B.Air in the fuel system
C.Coated fuel lines
D.Excessive vibration