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【简答题】
电路如图所示,其中电阻R=2kΩ,硅稳压管D Z1 、D Z2 的稳定电压U Z1 、U Z2 分别为6V和8V,正向压降为0.7V,动态电阻可以忽略。试求电路输出端A、B两端之间电压U AB = V。
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