题目内容
变压器的工作原理是（ ）
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异步电动机负载减小时，其转差率和转子电流将分别（ ）。
The cooling water of diesel engine should be treated because the ___.
In a common oil cooler circulated by sea water, the oil is at a ____ pressure than the sea water.
Vents are led from the engine to ____ for the release of air from the cooling water.
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