__________ is the act performed by or resulting from saying something; it is the consequence of, or the change brought about by the utterance.

在反馈放大电路中，如果反馈信号和输出电压成正比，称为_________反馈。

三极管具有放大作用外部电压条件是发射结()(____),集电结()(____)。

差分放大电路能够抑制(____)信号,放大(____)信号。

Many boys enjoy _______ football, basketball or baseball

Which do you think is ________, health or wealth？

_______________will not continue if an ongoing operation is changed or deletedA、

29．__________ when you are on the bus or bike．

Which do you think is _________________important, health or wealth?

And they can ______their passports______，making leaving or “escaping” virtually impossible.

能够放大直流信号的放大器叫作________。

Duty is an act or a course of action that people __________you to take by social customs, law or religion.