题目内容
The ______of the lubricating system is to supply all moving parts inside the engine with lubricating oil.
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______ is a mixture of water, oil, dirt and other products of combustion.
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.
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