In the closed cooling system, the water （）.

[单选题]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.A . a setting tankB . a service tankC . a head tankD . an expansion joint

[单选题]In a diesel engine cooling water system, a pH of 60 indicates a/an （）.A . slightly acidic conditionB . slightly alkaline conditionC . overtreatment of waterD . neutral condition of water

[单选题]A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.A . slight acidityB . slight alkalinityC . excessive alkalinityD . excessive acidity

[单选题]What is head tank in the closed cooling water system used for?A．for the release of air from the cooling waterB．providing expansion room for heated cooling waterC．a place for implementing water and water treatment agentD．all of the above

[单选题]The cooling water temperature （） over a period of 8 hours, and then shut down.A . should be gradually increasedB . should be gradually reducedC . should be constantly keptD . should be varied up and dow

[单选题]C．ooling water is circulated through______in some injectors.A．the nozzleB．the nozzle tipC．the internal passagesD．the fuel re-circulated

[单选题]The cooling water of the diesel engine should be treated with chemical, because it contains .A．alkaliB．acidityC．salinityD．impurity

[单选题]The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.A . dividing wallsB . divided wallsC . dividing linersD . divided jacket

[单选题]The cooling water is in direct contact with the outer surface of the liner as a result of which it is termed a （）.A . water linerB . wet linerC . dry linerD . drown liner

[单选题]Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.A . cylinder coversB . lubricating spaceC . crossheadD . exhaust manifold