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
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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
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C. legible
D. eligible