题目内容
It is necessary to use a nonfreezing solution in the _____of water-cooled engines.
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Forced air circulation is provided by a fan of generous capacity which is driven from the engine _____ by a belt or by fan blade formed in the flywheel.
It is necessary to use a nonfreezing solution in the cooling system of _____ engines.
We cannot eliminate internal friction, but we can reduce it to a controllable degree by the use of ______.
By______ , reduce friction between moving parts of engine.
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