当网格电压和频率很稳定时，双馈系统工作的很好。
Double feed systems work well if the grid voltage and frequency is very stable.
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风洞吹风中测出了单稳定极限环、双稳定极限环颤振的情况。
Both single and double stable limit cycle flutter states are found.
这种双稳定性的基础是什么？
What is the basis for this bistability?
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