单选题What is the effect of heated intake air on a diesel engine? （）AIncreases efficiencyBIncreases engine horsepowerCIncreases engine lifeDReduces engine horsepower
单选题
What is the effect of heated intake air on a diesel engine? （）
A
Increases efficiency
B
Increases engine horsepower
C
Increases engine life
D
Reduces engine horsepower
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