The pH value of water in a diesel engine closed cooling water system should be maintained between （）.
举一反三
- There is （） in any water cooling system for a diesel engine allowing for expansion and water make-up in the system as well as air vent and chemicals addition.
- Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.
- The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.
- In the closed cooling system， the water （）.
- The highest pressure in any closed diesel engine freshwater cooling system is at the （）.