单选题Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to ()Amaintain low pH in the cooling waterBreduce the cooling water temperatureCincrease cooling water hardnessDform a protective film on metal surfaces

单选题
Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to ()
A

maintain low pH in the cooling water

B

reduce the cooling water temperature

C

increase cooling water hardness

D

form a protective film on metal surfaces


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