Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）<br>A:Impeller<br>B:Compressor<br>C:After-cooler<br>D:Exhaust differ

Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）
A:Impeller
B:Compressor
C:After-cooler
D:Exhaust differ

出自：海船船员证

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