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日期:2024-04-23
In electric power transmission and distribution, volt-ampere reactive (var) is a unit in which reactive power is expressed in an AC electric power system. Reactive ......
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日期:2024-04-20
The lower cost of AC power distribution prevailed, though DC systems persisted in some ... financially backed the development of a practical AC power network. ..... Jump up ^ http://www.ieeeghn.org/wiki/index.php/Milestones:Mill_Creek_No....
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日期:2024-04-24
The abbreviations AC and DC are often used to mean simply alternating and direct, as when .... Electric current · High voltage direct current power transmission....