题目内容

交流发电机中产生磁场的元件是?

A. 定子
B. 转子
C. 整流器

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落电池电解液血应高出极板?

A. 5-10mm
B. 10-15mm
C. 15-20nun

交流发电机经整流后输出一个( )电压

A. 交流
B. 脉动直.流电压
C. 稳恒的直流电压

New measures have been introduced to traffic congestion(拥堵) in the city.

A. relieve
B. free
C. figure out
D. ease

Although she began as her brother’s research assistant, she went on to pursue her own studies.

A. dependent
B. independent
C. independence
D. dependence