创建索引文件的命令是( )。
A、ORDER
B、INEDX
C、SET INDEX TO
D、SET ORDER TO
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、/
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”。
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.
DSB和SSB调制系统的抗噪声是否相同?为什么?
多级目录结构中,重名问题得到了解决,同一目录中文件或目录重名是允许的。
A、对
B、错