题目内容
Automobile engine ______ are of many designs, but most are the centrifugal type.
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______is constructed to hold a large amount of water in tubes which provided a large area in contact with the atmosphere.
______is designed to seal the cooling system so that it operates under some pressure.
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.
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