电路如图所示,已知 R 1 =10 , R 2 =20 , 若 u i =1V , 则 u O = ( ) 。
A.
- 2 V
B.
- 1.5 V
C.
- 0.5 V
D.
+0.5 V
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参考答案:
举一反三
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