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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。

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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。

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在气动控制中，常用____来改变气缸的运动方向。

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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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His boat was four miles away, lashed up against an ice floe, and as close to us as was possible. (Para. 6)

A. His boat was four miles away and could not come closer, because a big ice floe clogged its way.
B. His boat was four miles away, because a big ice floe had pushed it away from the shores.

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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)

His boat was four miles away, lashed up against an ice floe, and as close to us as was possible. (Para. 6)

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。