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【单选题】
下列关于双极型晶体管（BJT）及其放大电路的说法，正确的是（ ）。A.
放大电路的输入电阻低一些更好
B.
BJT 是一种电压放大器件
C.
晶体管放大电路有三种基本连接形式：共基极，共发射极和共集电极电路
D.
双极型晶体管（ BJT ）放大电路可以放大直流和交流输入信号
E.
放大电路的输出电阻高一些更好
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