Q: What does the speaker say about negative feelings?
A. People should turn every negative feeling around.
B. Negative feelings can sometimes have positive effects.
C. Negative feelings often cause people to make mistakes.
D. People should never show negative feelings in public places.
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Q: What is the main idea of the passage?
A. People should learn to manage their emotions.
B. People should be patient with their negative feelings.
C. People should learn to analyze causes of unhappiness.
D. People should identify as many positive feelings as possible.
同步电机是指转子转速（）定子旋转磁场转速的电机
A. 等于
B. 大于
C. 小于
D. 不等于
下列不属于同步电机优点的是（）
A. 具有体积小
B. 响应快
C. 高功率因数
D. 成本低
下列属于开关磁阻电机的优点的是（ ）
A. 噪声大
B. 脉动转矩大
C. 能量转换度密度低于电磁式电机
D. 开关磁阻电机结构简单、成本低，适合高速运行
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