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Harmonics are periodic distortions of voltage, present-day, or energy sine waves. Harmonics in power distribution units are often caused by non-linear masses such as switched method dc electrical power materials and adjustable speed motor drives.xổ số kiến thiết Bộ trưởng Tài chính Hồ Đức Phớc chất vấn casino Vân ĐồnC�