trách nhiệm Secrets

Harmonics are periodic distortions of voltage, current, or electricity sine waves. Harmonics in electricity distribution devices are often brought on by non-linear loads such as switched manner dc electric power provides and adjustable speed motor drives.Không để vấn nạn "ăn chặn" đe dọa thể thao Việt Nam Chỉ trong vòng chưa �

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