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【单选题】
下图所示电路,下面的表达式中正确的是( )。A.
I 1 =R 2 I/(R 1 +R 2 )
B.
I 2 =-R 2 I/(R 1 +R 2 )
C.
I 1 =-R 1 I/(R 1 +R 2 )
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