变频调速是通过改变电机定子绕组供电的()。来达到调速的目的。
A. 频率
B. 转速
C. 磁极对数
D. 转差率
在该公司裁减的员工中,那些虽然在找工作但是却没有找到新工作单位的人属于()。
A. 劳动者
B. 失业者
C. 非劳动力
D. 就业者
Which of the following metaphors could the author most appropriately use to summarize his
A windmill.
B. A waterfall.
C. A treadmill.
D. A gyroscope.
E. A bellows.
It can be inferred from the passage that the author most probably thinks that giving the disenfranchised "a piece of the action "(line 46)is
A. a compassionate, if misdirected, legislative measure.
B. an example of Americans" resistance to profound social change.
C. an innovative program for genuine social reform.
D. a monument to the efforts of industrial reformers.
E. a surprisingly "Old World" remedy for social ills.