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【简答题】
在图1 - 3 - 14所示电路中, Us 1 =12V, Us 2 =-2V, Us 3 =4V,R 1 =2KΩ , R 1 =2KΩ , R 2 =3KΩ , R 3 = R 4 =5KΩ ,则 A 、 B 两点的电压为 U AB =______V 。
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