单选题Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?（）AIntake manifoldBWater-cooled exhaust systemCAfter-coolerDExhaust diffuser
单选题
Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?（）
A
Intake manifold
B
Water-cooled exhaust system
C
After-cooler
D
Exhaust diffuser
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