The pH value of water in a diesel engine closed cooling water system should be maintained

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The pH value of water in a diesel engine closed cooling water system should be maintained between _____.

A.6.0 to7.5

B.8.0 to 9.5

C.10.0 to 11.5

D.12.0 to 13.5

请帮忙给出正确答案和分析,谢谢!

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