提升位能负载时的工作点在第一象限内,而下放位能负载时的工作点在第( )象限内。
查看答案
变压器的工作原理是（ ）
A. 静态感应
B. 电磁感应
C. 静电屏蔽
D. 等效变换
异步电动机负载减小时，其转差率和转子电流将分别（ ）。
A. 增大/增大
B. 减小/减小
C. 增大/减小
D. 减小/增大
The cooling water of diesel engine should be treated because the ___.
A. cooling water is alkalescence
B. cooling water has acidity
C. cooling water has salinity
D. cooling water has impurity
In a common oil cooler circulated by sea water, the oil is at a ____ pressure than the sea water.
A. larger
B. safety
C. lower
D. bursting
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