题目内容：
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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单选：Which of the following conditions may contribute to the formation of d
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A．Poor combustion
B．High cylinder oil consumption
C．Leaking exhaust valves
D．All of the above