(多选题)21: 下列叙述不正确的是( )
A: 叠加原理适用于任何电路
B: 线性电路中的电压、电流和功率都可以叠加
C: 叠加原理只适用于线性电路中电流或电压的计算,不能用来计算功率
D: 叠加原理只能用来计算线性电路中的电流
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