One pair of changes is called a cycle. The number of cycles per second is called frequency, which usually represented by Hertz *(the symbol is: Hz). Abbreviation: AC.
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释义
一双变化称为一循环。每秒内的循环称为频率。频率通常以赫芝为单位(符号 Hz)。交流电的英文缩写是:AC。
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