A.P’+P’’=10W B.(I’-I’’)R=20W C. D.因Us、Is未知,无法计算

A.P’+P’’=10W B.(I’-I’’)R=20W C. D.因Us、Is未知,无法计算

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A.Y2=Acos[2πt-π/2] B.Y2=Acos[2πt-π] C.Y2=Acos[2πt+π/2] D.Y2=2Acos[2πt-0.1π]

A.Y2=Acos[2πt-π/2] B.Y2=Acos[2πt-π] C.Y2=Acos[2πt+π/2] D.Y2=2Acos[2πt-0.1π]

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