Which of the engine components listed increases air charge density and helps to improve engine operating efficiency?（）<br>A:Intake manifold<br>B:Water-cooled exhaust system<br>C:After-cooler<br>D:Exhaust diffuser

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

出自：海船船员证

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