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1.如图所示,电源两端电压保持不变,闭合开关S和S′时,电压表V的示数为U1,电流表A的示数为I1,电阻R1的功率为P1,电阻R2的功率为P2;当只闭合开关S时,电压表V的示数为U2,电流表A的示数为I2,电阻R2的功率为1W,电阻R1 R3的总功率为P。已知:U1=4U2,5P2=16P。下列说法正确的是( )
A: I1I2=4:3
B: P1=8W
C: R1R2=2:1
D: P=5W
  • 提示1IOetieaViOeUtei3r+S4pOS4qu+8mjHjgIFSPHN1Yj4xPC9zdWI+44CBUjxzdWI+Mjwvc3ViPuS4suiBlA==
  • 提示2IFI8c3ViPjE8L3N1Yj7jgIFSPHN1Yj4yPC9zdWI+IOOAgVI8c3ViPjM8L3N1Yj7kuLLogZQsPGk+55SxVTwvaT48c3ViPjE8L3N1Yj49NDxpPlU8L2k+PHN1Yj4yPC9zdWI+77yMPGk+STxzdWI+MTwvc3ViPjwvaT7vvJo8aT5JPC9pPjxzdWI+Mjwvc3ViPj00OjENCuOAgueUseeUtea1geavlO+8jOW+l++8mlI8c3ViPjM8L3N1Yj49M++8iFI8c3ViPjE8L3N1Yj4rUjxzdWI+Mjwvc3ViPu+8ieeUsTU8aT5QPC9pPjxzdWI+Mjwvc3ViPj0xNjxpPlAgPC9pPjxpPuWSjCBJPHN1Yj4xPC9zdWI+PC9pPu+8mjxpPkk8L2k+PHN1Yj4yPC9zdWI+PTQ6Me+8jOW+l++8mjVSPHN1Yj4yPC9zdWI+PSBSPHN1Yj4xPC9zdWI+K1I8c3ViPjM8L3N1Yj4=
  • 提示3IOeUseatpOW+l+WIsHzvvJo8aT5SPHN1Yj4xPC9zdWI+PC9pPu+8mjxpPlI8L2k+PHN1Yj4yPC9zdWI+PTE6Mg0K77yM55SxPGk+UjwvaT48c3ViPjI8L3N1Yj7nmoTlip/njofkuLoxV++8jOeUseeUtea1geavlOWSjOeUtemYu+WFs+ezu+W+l1A8c3ViPjE8L3N1Yj49OFfvvIxQPTVX