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【单选题】
对于纯电阻正弦交流电路,其两端电压uR与电流i的参考方向一致,按照电量符号一般的规定,则下列式子错误的是______。A.
uR=iR
B.
UR=IR
C.
P=I2R
D.
Q=I2R
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