负反馈是指取______中的一部分加到输入端，其相位与输入信号_____爱下问搜题

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问题填空题

负反馈是指取______中的一部分加到输入端，其相位与输入信号______，以起到抵消部分输入信号的作用。

答案

参考答案：输出信号；反相

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Hello,everyone. Because of the high rate of school violence(力)in some areas, teenagers’ safety becomes a serious problem. We are planning to set up an organization named School Watch to make sure that students have a safe school environment. Please be part of our plan!
What is School Watch
School Watch is a volunteer project in our school. It helps us stop violence and improve the quality of school life. It will keep yourself and your schoolmates safe. The other members of School Watch care for you and your classroom and you do the same for them.
Is it for everyone
Anybody can become a member of School Watch because everyone has something to offer.
What else can it do
School Watch makes it possible for us not only to help each other But also to make friends with each other. Some members may offer to help schoolmates who have problems with their homework.
Who is the Best School Watcher
Our school will look for the Best School Watcher and give him or her lots of prizes. You could be the one !
How do you start
To be part of this plan, the only thing you need to do is to talk to the director of the plan in your grade. If you want to get more information, check the official website at www.schoolwatch.com.

The members of School Watch are probably ______.

A．teenagers

B．parents

C．policemen

D．doctors