2. He answered the reporters' questions f________.
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3. They avoid all luxuries and live a very f_______ life.
4. Don't i_______ in what doesn't concern you.
5. B_______ scream was still haunting witness to the accident.
永磁同步电机的原理是在电动机的（）中通入三相电流，在通入电流后就会在电动机的定子绕组中形成旋转磁场。
A. 壳体
B. 转子绕组
C. 定子绕组
D. 换向器电刷
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