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单项选择题

如图所示电路中,三只二极管参数相同。若A、B、C三端电压分别为2V、3V、4V,若二极管压降为0.7V,试分析各二极管工作情况,求端口D的电压值。  ( )                 A. 0.7V B. 1.7V C. 3.3V D. 2.5V

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