题目内容

Listen to the song twice and fill in the blanks with what you hear. There comes a timeWhen we ___________________________________,When the worldMust___________________________________ as one.There are people dying;And it’s time to___________________________________to life,The greatest gift of all.We can’t go on pretending day by dayThat someone somewhere will soon___________________________________.We are the partOf God’s great big family.And the truth you know,Love is___________________________________.We are the world,We are the children,We are the onesWho make a brighter day.So let’s start giving.There’s a choice we are making,We are saving our own lives.It’s true we’ll make a better day,Just you and me.Send them___________________________________.So they’ll know that someone cares.And their lifeWill be___________________________________.As God has shown us,By turning___________________________________.So we all must lend a helping hand.We are the world,We are the children,We are the onesWho make a brighter day.So let’s start giving.There’s a choice we are making,We are saving our own lives.It’s true we’ll make a better day,Just you and me.When you’re___________________________________,There seems no hope at all.But if you just believe,There’s no we can fail.Let us realizeThat a change can only comeWhen we___________________________________as one.We are the world,We are the children,We are the onesWho make a brighter day.So let’s start giving.There’s a choice we are making,We are saving our own lives.It’s true we’ll make a better day,Just you and me.

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交流负反馈是指( )

A. 阻容耦合放大电路中所引入的负反馈
B. 在直流通路中所引入的负反馈
C. 在交流通路中所引入的负反馈

直流负反馈能够( )

A. 稳定静态工作点
B. 稳定放大倍数
C. 改变输入电阻和输出电阻
D. 展宽频带

根据反馈的效果可以区分反馈的极性,使放大电路净输入量增大的反馈称为正反馈。

A. 对
B. 错

在反馈一般表达式中,Af不仅仅表示电压放大倍数或者是电流放大倍数,而是具有更为广泛的意义,随反馈类型的不同而不同。( )

A. 对
B. 错

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