单项选择题
The pH value of water in a diesel engine closed cooling water system should be maintained between （）.
A.60 to75
B.80 to 95
C.100 to 115
D.120 to 135
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Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by （）.
A.heat conduction into the injected fuel oil
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单项选择题
In a diesel engine cooling water system, a pH of 60 indicates a/an （）.
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