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Where is the woman going

A. To the post office.
B. To the museum.
C. To the fruit shop.

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Where did this conversation probably take place

A. In a hotel.
B. In a restaurant.
C. In a cafeteria.

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如何从电动机的定子和转子结构外观上来区别直流电动机、鼠笼式异步电动机和绕线异步电动机？

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下列关于三相异步交流电动机的叙述中，正确的有______。

A. 额定转矩由额定功率(输出机械功率)和额定转速求得，即T_N=9550P_N/n_N
B. 过载系数λ=T_max/T_N，一般异步电动机的过载系数为1.6～2.5
C. 起动转矩T_Q与额定转矩之比大约为1.0～2.0
D. 在一定的电源电压和转子电阻下，转矩比与转速的关系曲线称为电动机的机械特性曲线
E. 三相异步电动机当负载在空载与额定值之间变化时，电动机的转速变化不大，这种特性即为硬机械特性

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What’ s the matter with Jane

A. She looks pale.
B. She has got a fever.
C. She has got a cold.

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Where is the woman going

A. To the post office. B. To the museum. C. To the fruit shop.

Where did this conversation probably take place

如何从电动机的定子和转子结构外观上来区别直流电动机、鼠笼式异步电动机和绕线异步电动机？

下列关于三相异步交流电动机的叙述中，正确的有______。

What’ s the matter with Jane

A. To the post office.
B. To the museum.
C. To the fruit shop.