What are the possible topics for one you meet at a grocery
A. the weather
B. the current situation
C. your family
D. your hobbits
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What are the possible topics for small talk with one you work together?
A. sports
B. the news
C. the weekends
D. entertainment, such as the latest movies
E. food
F. salary
What are the possible topics for small talk with your friends or family?
A. your family or family issues
B. travel
C. things you know they like, such as hobbies or interests
D. one of your friends's secrets
三相异步电动机旋转磁场的大小与（ ）有关。
A. 频率
B. 电压
C. 电流
D. 功率
E. 磁极对数
三相异步电动机转子转速的大小与（ ）有关。
A. 电流
B. 电压
C. 频率
D. 磁极对数
E. 转差率
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