题目内容

The company always sends out formal________( invite) to promotion events.

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A chairperson is________( responsibility) for the smooth running of a meeting.

Frances is the top student in our class, but her aim is to ________(achievement) better exam results.

装配单元中为了确定装配台料斗内是否放置了待装配工件，使用了（）进行检测。

A. 光纤传感器
B. 磁性开关
C. 电感传感器
D. 漫射式光电传感器

光纤式光电开关由和两部分组成,这两者用光纤相连。