题目内容
______ is a mixture of water, oil, dirt and other products of combustion.
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Cylinder head contains water ______ for cooling engine.
Thus, there is constant circulation of ______ between the pan and the working parts of the engine.
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 ______.
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