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【单选题】
多频电路(非正弦交流)---21263 图示电路中 V, A,则 与 发出的平均功率Pu与Pi为 答( )A.
Pu=20W,Pi=-20W
B.
Pu=-20W,Pi=20W
C.
Pu=10W,Pi=-10W
D.
Pu=0,Pi=0
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