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【单选题】
电路如图所示,运算放大器的饱和电压为 12V ,双向稳压管的稳定电压为 ,设稳压向压降为零,当输入电压 u i =2sin t V 时,输出电压 u O 应为 ( )A.
幅值为 12V 的
B.
幅值为 6V 的
C.
幅值为 6V 的正弦波
D.
幅值为 12V 的正弦波
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