题目内容

7.(27)

A. How’s it going?
B. What’s the problem?
C. I’m sorry. I don’t have money.
D. Who knows?

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8.(28)

A. Why did you do it?
B. What does it do?
C. What can we do?
D. How do you do?

9.(29)

A. I’ll give you a discount.
B. They don’t accept checks.
C. Let’s go check it out.
D. The store is selling at a discount.

10.(30)

A. Who did it?
B. What’s the weather like?
C. What a bad idea!
D. How terrible!

反馈型振荡器的环路增益是反馈信号与激励源信号的比值

A. 对
B. 错

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