正弦交流电压的有效值为 220V , ψ = 30° , 下列各式是否正确? prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> (1) u =220 sin ( ωt +30°)V (2) U =220 / 30° V (3) =220e j30° V (4) = 220 sin ( ωt +930°)V (5) u =220 / 30° V (6) u = 220 / 30° V
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