单项选择题
In a diesel engine cooling water system, a pH of 60 indicates a/an （）.
A.slightly acidic condition
B.slightly alkaline condition
C.overtreatment of water
D.neutral condition of water
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相关考题
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单项选择题
Which of the following statements concerning fire-tube boilers is correct?（）
A.Combustion gases flow through the tubes
B.Flames impinge on the tubes
C.Combustion occurs in the tubes
D.Water flows through the tubes -
单项选择题
A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.
A.slight acidity
B.slight alkalinity
C.excessive alkalinity
D.excessive acidity -
单项选择题
Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.
A.cold corrosion of the nozzles
B.fuel viscosity for better atomization
C.carbon accumulation on the nozzles
D.fuel detonation in the cylinders
