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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