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【单选题】
有一三相桥式整流电路接大电感负载，回路电阻RL=10Ω，变压器采用△/Y接法，初级接380V三相交流电。当控制角α=0°时，输出平均电压为117V。当控制角α=60°时，输出的平均电压为U d 为（）
A.
58.5V
B.
98V
C.
117V
D.
340V
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