Two data files have been deleted at the operating system level by accident. Your database is running in ARCHIVELOG mode and online backups are taken nightly. One of the data files that has been deleted belongs to the USERS tablespace on the other belongs to the SYSTEM tablespace. How can you recover from this situation？（）
A、Shut down the database, restore the two data files and then start up the database.
B、Take the system and users tablespace offline, restore the two data files, recover the two datafiles, and then bring the SYSTEM and USERS tablespaces online.
C、Shut down the database, restore the two data files, start up the database in MOUNT mode, recover the two data files, and then alter the database open.
D、Take the SYSTEM and USERS tablespaces offline, recover the two datafiles and then bring the SYSTEM and USERS tablespaces online.
Unix中，哪个目录下运行系统工具，例如sh，cp等？（）
A、/bin/
B、/lib/
C、/etc/
D、/
（）不是项目质量管理的原则。
A、满足项目利益相关者的需求
B、注重过程质量和项目交付成果质量
C、管理者对持续改进负责
D、考虑质量管理体系
You can use Oracle Flashback to look at past activity in your database. What are two other characteristics of Oracle Flashback？（）
AOracle Flashback uses undo information to construct consistent data.
BYou can use a cursor opened while using an Oracle Flashback image to perform DML once you deactivate Oracle Flashback in your session.
CYou can only use Oracle Flashback view of the data if the required records are still in the online redo log files.
DOracle Flashback lists the DML that was executed during the period you identify when initiating your session.
创建索引文件的命令是（ ）。
A、ORDER
B、INEDX
C、SET INDEX TO
D、SET ORDER TO
将第一张幻灯片副标题的动画效果设置为：“切入”、“自左侧”；将第二张幻灯片版式改变为“垂直排列标题与文本”；在演示文稿的最后插入一张版式设置为“仅标题”幻灯片，键入“细说生活得失”。