Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to（）.<br>A:reduce electrolytic action on heat exchanger metals<br>B:keep heat transfer surfaces shiny and clean<br>C:prevent rapid accumulation of marine growth<br>D:provide a protective coating on heat exchanger surfaces

Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to（）.
A:reduce electrolytic action on heat exchanger metals
B:keep heat transfer surfaces shiny and clean
C:prevent rapid accumulation of marine growth
D:provide a protective coating on heat exchanger surfaces

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