题目内容

基站安装需要的设备及附件有基站设备、POE、扇区天线、天线馈线、（）、屏蔽RJ45水晶头、天线支架、接地线、防水套件基站同步单元。

A. 基带电缆
B. 服务器
C. 磁盘阵列

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A database is running in ARCHIVELOG mode and regular backups are performed. A user receives the following error message . Which is the recommended sequence of operations you need to perform for the query successfully?（）

A. Drop the affected tablespace, re-create the tablespace, restore the datafiles, and the tablespace.
B. Take the affected datafile offline (if not already offline), restore the damaged image of the datafile, and then bring it online.
C. Restart the database in MOUNT mode, restore the damaged datafile, recover the datafile and then open the database with resetlogs.
D. Put the database in RESTRICTED mode, restore all the datafiles in the affected datafile and recover the tablespace, and then put the database in normal operational mode.&e

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