题目内容

自动化生产线具有非常强的运行特性,主要体现在以下____、____和____三个方面。

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连接S7-200系列PLC与个人计算机需要使用____编程软件。

在气动控制中,常用____控制气缸的运动速度,____控制气缸的运动方向。

在气动控制中,常用____来改变气缸的运动方向。

Choosetheanswerthatcorrectlyinterpretsthesentencefromthetext.And it was that compulsion, to bring a quarter of a ton of dark grey rock back home, that very nearly led to our undoing. (Para. 4)

A. We felt we must bring back the dark- grey rock samples weighing a quarter of a ton, and the urge to do that almost killed us all.
B. We had to bring back the quarter-ton of dark-grey rock, and that made the trip extremely dangerous and even impossible.

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