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已知变压器二次电压有效值U，则桥式整流电容滤波电路输出电压平均值UO等于（）

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已知变压器二次电压有效值U，则桥式整流电容滤波电路输出电压平均值UO等于（）

A.0.9U

B.1.2U

C.U

D.2U

参考答案:

答案：B

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