单选题Performance of a turbocharged engine can be improved by（）Adecreasing the amount of valve overlapBpreheating the air intakeCafter-cooling the intake airDpreheating light fuel
单选题
Performance of a turbocharged engine can be improved by（）
A
decreasing the amount of valve overlap
B
preheating the air intake
C
after-cooling the intake air
D
preheating light fuel
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