题目内容
Oils used in automobiles need some ______ to improve their characteristics.
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When water freezes, it expands approximately ______ percent in volume.
In an automobile engine,heat flows or transfers from the iron or aluminum cylinder to the cooling water,and from the coolant to the copper or aluminum ______ .
In an automobile engine, heat flows or transfer from the iron or aluminum cylinder to the______, and from the coolant to the copper or aluminum radiator.
The coolant gets hot______ it goes through the engine.
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