根据汽车行业标准QC/T73-1993《汽车电气设备产品型号编制方法》规定，某汽车交流发电机的型号组成中的产品代号为JF，JF全称：
A. 整体式交流发电机
B. 带泵交流发电机
C. 普通交流发电机
D. 无刷交流发电机
查看答案
三相交流发电机中产生旋转的磁场的部件是：
A. 转子
B. 定子
C. 风扇
D. 以上全部
What happened to Helen Keller when she was a little baby?
A. She caught a high fever which left a mark on her face.
B. She was not allowed to contact the outside world.
C. She became blind and deaf as a result of a terrible fever.
D. She was thrown into a dark room because she made a lot of noise.
How did Helen explore the world as a child?
A. She talked with people around him.
B. She helped to do many kinds of housework.
C. She followed her mother wherever she went.
D. She made use of her senses of touch and smell.
Why did little Helen often feel frustrated?
A. She found herself different from other people.
B. She could not make herself understood when she talked.
C. She was not taken good care of by her family.
D. She found herself in a confusing world.
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