– Gi?i Ph? là gi?i quy ??c dành cho các t? vé s? kh?p five s? cu?i cùng c?a dãy s? c?a k?t qu? gi?i ??c bi?tHarmonics are periodic distortions of voltage, existing, or power sine waves. Harmonics in electricity distribution techniques are often brought on by non-linear masses such as switched method dc ability materials and adjustable pace