单选题Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will ().Areduce engine horsepower outputBaid in silencing the exhaust noiseCincrease the mean effective pressureDcontribute to effective cylinder scavenging

单选题
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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