單項(xiàng)選擇題

Before starting a diesel engine, you should always（）

A.check the pyrometer readings
B.check the crankcase oil level
C.check the fuel oil strainers
D.clean the fuel system

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Sludge formation in a diesel engine lube oil system is caused by（）

A.carbonization of oils from the combustion chambers
B.emulsions of lube oil and water
C.coagulation of unburned fuel below the piston rings
D.all of the above

單項(xiàng)選擇題

A diesel engine is turned at normal cranking speed, but fails to fireThis can occur from （）

A.low lube oil temperature
B.low starting air temperature
C.air in the fuel injection
D.water in the starting air system