A SECONDARY function of a waste heat boiler is to （）.<br>A:reduce engine exhaust noise<br>B:reduce engine back pressure<br>C:increase engine cycle efficiency<br>D:increase turbocharger efficiency

A SECONDARY function of a waste heat boiler is to （）.
A:reduce engine exhaust noise
B:reduce engine back pressure
C:increase engine cycle efficiency
D:increase turbocharger efficiency

出自：海船船员证

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