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问题

Turbocharged four-stroke/cycle diesel engines utilize valve overlap for_________.A.improvi


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

请帮忙给出正确答案和分析,谢谢!

参考答案
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