以下为句子列表：
英文: AC Alternating Current (AC) is electric current that alternates between a positive maximum value and a negative maximum value at a characteristic frequency, usually 50 or 60 cycles per second (Hertz).
中文: 交流交流是指电流在正负最大值之间以特定的频率变动，通常频率为50或60赫兹。
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