题目内容

步进电动机转速主要取决于( )。

A. 电脉冲的总数
B. 电脉冲的频率
C. 电流的大小
D. 电压的高低

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The scientist ______ his great energy and endurance to his habit of, dozing off whenever he wanted.

A. contributed
B. attributed
C. devoted
D. distributed

由PLC进行处理和输出的低速辅助信息M、S、T指的是( )。

A. 辅助功能、主轴转速功能、刀具功能
B. 进给功能、主轴转速功能、刀具功能
C. 辅助功能、进给功能、刀具功能
D. 辅助功能、主轴转速功能、进给功能

The new constitution will take ______ from the beginning of July.

A. effect
B. position
C. place
D. post

No one is more ______ than Frank for the promotion as a sales department manager; he has been a salesman for years and he knows the market well.

A. illegible
B. legitimate
C. legible
D. eligible

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