题目内容
______is designed to seal the cooling system so that it operates under some pressure.
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The _____ is designed to draw cooling air through radiator core.
The _____ is designed to close off the flow of water from engine to radiator until the engine has reached the desired operating temperature.
Automobile engine water pump are of many designs, but most are the ______ type.
The radiator is constructed to hold a large amount of water in tubes which provided a large area in contact with the______.
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