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A: Have you ever been in an earthquake?B: Yes, 1.__________________. One of them is the most terrible experience I have ever had.A: I'm sorry to hear that. When did it happen?B: It happened on 2._______________ 20th, 2013. Many people lost their lives in that disaster.
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A: Spring is coming. Shall we go out for a 3._____________ to the countryside?B: Good idea! Life in the countryside is really simple and relaxing.A: I quite agree with you. The grass is greener and the air is 4. ____________ than those in the city.B: That's right. Getting close to nature is also good for our health. Is the weeken OK?A: Yes, it's fine. Maybe we should spend more time 5._______________ the beautiful nature scenery in the future.B: Sounds wonderful.
忽略定子电阻的前提下,凸极同步发电机输出最大功率时,功角θ
忽略定子电阻的前提下,隐极同步发电机输出最大功率时,功角θ
采取以下哪种措施，可以提高同步发电机的静稳极限
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