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【单选题】
电路如图所示,已知 I 1 = 1A , I 2 = 2A , I 3 = -3A , I 4 = 8A ,电流 I 5 为 ( ) 。A.
0A
B.
6A
C.
8A
D.
1 0A
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A.
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B.
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C.
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D.
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