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为了稳定放大电路的输出电流并且提高输入电阻,应采用(     )。
A、串联电压负反馈 
B、并联电流负反馈
C、串联电流负反馈 
D、并联电压负反馈

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    用圆环命令可以绘制圆。

    答案:正确
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    25-28. Read the following statements and choose what kind of attention getter is used.‏
    So, this happy pic of me was taken in 1999. I was a senior in college, and it was right after a dance practice. I was really, really happy. And I remember exactly where I was about a week and a half later. I was sitting in the back of my used minivan in a campus parking lot when I decided, I was going to commit suicide. ‏

    A.Giving amazing information and statistics
    B.Involving your audience
    C.Presenting a quotation or a proverb
    D.Telling a story
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