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推焦系数有何意义？

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芳烃抽提工艺设置的意义是什么？

You are evaluating whether to add an additional hard disk drive to each file server and create a striped volume for the data files. Which storage requirement is met by adding the hard disk drive and creating the striped volume？（）

A. Improve data availability on the file servers.
B. Improve the performance of the file servers.
C. Provide additional storage on the file servers without causing downtime.
D. Enable users to access the previous versions of all the files stored on the file servers.

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儒线轨道有条件时，特大桥、大桥及长度大于1000m的隧道内，宜采用()。

A. 碎石道床
B. 有碴道床
C. 无碴道床
D. 一级碎石道碴道床

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电击特点（）

A. 伤害内部
B. 致命电流小
C. 无明显痕迹
D. 死亡

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