Cavitation erosion in the cooling water system of a diesel engine usually occurs at the pump impeller, and on the waterside of the （）
The pH value of water in a diesel engine closed cooling water system should be maintained between （）.
In a refrigeration system, if the cooling water to the condenser fails, the（）.
In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.
If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）
In a diesel engine cooling water system, a pH of 60 indicates a/an （）.
A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.
In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）
One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）
（） allows for expansion and water make up in the water cooling system.
In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）
A diesel engine cooling water system with a pH factor of 30 indicates a condition of （）.
The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）
In the closed cooling system, the water （）.
The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.
Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）
If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）
Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant? （） (1) too little cooling water (2) too much cooling water (3) too warm cooler water
An increasing head pressure in a refrigeration system, without any corresponding change in the cooling water inlet temperature, would probably be caused by （）.
In a diesel engine, an integral liner is one in which the cooling water （） Ⅰ.flows through the cylinder liner jackets Ⅱ.touches the outer side of the liner
Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）
Which of the following may cause that excessively warm water leaves the condenser in a refrigeration plant？ (1) too little cooling water; (2) too much cooling water; (3) too warm cooler water.
Man depends on water for many things. He needs it for drinking. He needs it for growing food. He needs it for keeping himself clean and free from illness. He needs more and more water for industry. People often forget how necessary water is for industry. Imagine, for example, the immense quantities of water used by the great cooling towers of steel works. The demand for water is growing every day. It is closely connected with the increasing population and with the pressing problem of providing enough food. But the world has not yet found ways of storing enough water to satisfy all these important needs, not even in west countries like England. Great efforts are being made today to store water, particularly in hot countries where the rainfall is small.
