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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