单选题The PRIMARY function of a waste heat boiler is to （）.Areduce engine exhaust noiseBreduce engine back pressureCrecover heat which otherwise would be lostDincrease turbocharger efficiency
单选题
The PRIMARY function of a waste heat boiler is to （）.
A
reduce engine exhaust noise
B
reduce engine back pressure
C
recover heat which otherwise would be lost
D
increase turbocharger efficiency
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