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【单选题】
已知某电路两端的电压为u=28.28sin(314t+120°)V,通过的电流为i=7.07sin(314t+60°)A,则该电路中消 耗的有功功率为
A.
86.6W
B.
50W
C.
173.2W
D.
100W
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