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简述PHP与其他CGI在稳定性上进行比较。

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You configured the Flash Recovery Area （FRA） for your database. The database instance is running inARCHIVELOG mode. The default location for the archived redo log files is the Flash Recovery Area. Which twofiles are removed automatically if the space is required in the FRA as per the retention policy（）

A. Flashback log files
Backups that have become obsolete
C. User managed backups of the data files and control files
D. Archived redo log files that have multiple copies in a different archive location and not backed u

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以下会导致减顶回流罐污水带油的是（）。

A. 回流罐温度过高
B. 回流罐压力过高
C. 回流罐界位控制不好
D. 塔顶污水泵故障

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unix下显示文件头部的命令是（）。

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列出反相色谱法对流动相的基本要求。

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