Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.<br>A:improving cylinder scavenging<br>B:preheating the combustion chamber<br>C:reducing air charge density<br>D:preventing valve wear

Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.
A:improving cylinder scavenging
B:preheating the combustion chamber
C:reducing air charge density
D:preventing valve wear

出自：海船船员证

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