單項選擇題

Which of the following conditions may contribute to the formation of deposits on the blades of the turbocharger turbine?（）

A.Poor combustion
B.High cylinder oil consumption
C.Leaking exhaust valves
D.All of the above

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Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）

A.Reduce engine speed to idle before removing the filter
B.Soak the dirty filter in kerosene only
C.Blow out the air inlet with compressed air
D.Cover the air inlet after removing the filter

單項選擇題

Which of the following problems may occur if the clearance between a piston and cylinder liner is insufficient?（）

A.Excessive wear
B.Scuffing of the liner
C.Piston seizure
D.All of the above