题目内容
Thus, there is constant circulation of ______ between the pan and the working parts of the engine.
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In an automobile engine, heat flows or transfer from the iron or aluminum ______ to the cooling water, and from the coolant to the copper or aluminum radiator.
Sometimes the fan is installed on the ______.
Automobile engine ______ are of many designs, but most are the centrifugal type.
______is constructed to hold a large amount of water in tubes which provided a large area in contact with the atmosphere.
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