Which of the factors listed has the greatest effect on the mechanical efficiency of a diesel engine?（）<br>A:temperature of the intake air<br>B:friction within the engine<br>C:mechanical condition of the supercharger<br>D:mechanical condition of the turbocharger

Which of the factors listed has the greatest effect on the mechanical efficiency of a diesel engine?（）
A:temperature of the intake air
B:friction within the engine
C:mechanical condition of the supercharger
D:mechanical condition of the turbocharger

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