问题
问答题 简答题
三点式振荡器电路中振荡回路的三个电抗必须具备什么条件，才能使电路产生自激振荡？为什么？
答案
参考答案：
相位条件：反馈电压与输入电压相位相同，必须正反馈。
幅值条件：反馈电压与输入电压的幅值相等，必须有足够的反馈电压。
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三点式振荡器电路中振荡回路的三个电抗必须具备什么条件，才能使电路产生自激振荡？为什么？
参考答案：
相位条件：反馈电压与输入电压相位相同，必须正反馈。
幅值条件：反馈电压与输入电压的幅值相等，必须有足够的反馈电压。
Kim: What do you want to do in the future, Bob? Bob: I want to become a well-known writer. 小题1: Kim: I want to be a singer. I enjoy singing very much. Bob: I always hear you sing in your classroom and in the dormitory. Kim: You know, practicing is very important. My teacher always asks me to practice as much as possible. Bob: 小题2: Kim: Three hours a day on weekdays and six hours a day on weekends. Bob: Do you think it is boring to practice singing every day? Kim: 小题3:Singing is a great pleasure for me. I have entered for the “Future Star Cup” singing contest. It will be held next week. Bob: Do you think you will win in the contest? Kim: Yes. Before I entered for this contest, I had already taken part in many singing contests, and I had won some prizes. I’m very confident about myself. By the way, I’ve heard that our school held a composition (作文) contest last week. 小题4: Bob: No. I didn’t think I would win it. I don’t practice writing compositions much, you know. Kim: You should write more and take every chance to practice, or your wish to become a great writer will not come true. Bob: 小题5: Kim: You’re welcome.
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