The cooling water is in direct contact with the outer surface of the liner as a result of which it is termed a （）.

[名词解释] 直接接触电击（direct contact）

[单选题]A．s for turbine oil, contact with water in the form of steam will be inevitable so good______properties will be essentialA．defrostingB．de-oilingC．demulsifyingD．dehumidifying

[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]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]In the closed cooling system, the water （）.A . is made to circulate out of the systemB . is made to circulate within the systemC . is made circulate within the systemD . is made circulate out of the system

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

[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