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【单选题】
如图,单相桥式整流电路,整流电路输入的交流电压有效值为20 V。如桥中有一只二极管虚焊,则负载上的脉动电压平均值为______
A.
20 V
B.
18 V
C.
0 V
D.
9 V
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