Còn   là t?i gi? quay s? m? th??ng X? s? Mi?n B?c m? th??ng vào 18h15' hàng ngàyHarmonics are periodic distortions of voltage, present, or electrical power sine waves. Harmonics in power distribution programs are often attributable to non-linear masses such as switched manner dc power materials and adjustable speed motor drives.V?y nên nhà