题目内容
It is necessary to use a nonfreezing solution in the cooling system of _____ engines.
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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.
By______ , prevent leakage between parts such as pistons, rings and cylinders.
______ can carry away heat by flowing between friction-generating parts.
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