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对于 V(t) = 120cos(2pi * 60 t) V 和 |Z| = 40 Omega 相位角30度，计算平均耗散功率。
对于 V(t) = 120cos(2pi * 60 t) V 和 |Z| = 40 Omega 相位角30度，计算平均耗散功率。
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