题目内容

__ and short of breath, Andy and Ruby were the first to reach the top of the mountain.

A. to be tired
B. tired
C. tiring
D. being tired

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There's a man at the reception desk who seems very angry and I think he means __ trouble.

A. make
B. to make
C. making
D. made

数字设备公司(DEC公司)在年首先研制出世界上第一台可编程序控制器,型号为,并在的自动生产线上试用成功。

可编程序控制器是一种装置,专为在工业环境下应用而设计。

PLC的发展趋势主要体现在、、、、和等几个方面。

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