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电路如图所示，设二极管D1，D2，D3的正向压降忽略不计，则输出电压uO=（）。

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电路如图所示，设二极管D1，D2，D3的正向压降忽略不计，则输出电压uO=（）。

A.－2V

B.0V

C.6V

D.12V

参考答案:

答案：－2V

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