问题描述：
[单选]
Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will（）．
A．reduce engine horsepower output
B．aid in silencing the exhaust noise
C．increase the mean effective pressure
D．contribute to effective cylinder scavenging
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答案解析：无
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上一篇：Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine？
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