【单选题】【消耗次数：1】
功率放大电路与电压放大电路、电流放大电路的共同点是（ ）。
①
都使输出电压大于输入电压
②
都使输出电流大于输入电流
③
都使输出功率大于信号源提供的输入功率
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在放大电压信号时，通常希望放大电路的输入电阻和输出电阻分别为（）。
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