You would like to configure an Ethernet interface with the following characteristics: Fast Which set of configuration commands accurately completes this task?()
A、 A
B、 B
C、 C
D、 D
下图所示为一个图形的绘制过程,步骤为首先完成了左侧的圆弧,第二步是绘制与圆弧相切的长度为300的直线,正在绘制右侧的圆弧。从图中显示的内容判断,正确的描述为()。
A、左侧圆弧的半径为200
B、绘制图中直线时可以不使用鼠标,键盘输入直线命令,按两次Enter键,键盘输入300,按两次Enter键
C、绘制右侧圆弧时,在圆弧命令的第一条提示后,直接按Enter键
D、功能键“正交”、“捕捉”肯定是打开的
Which statement correctly describes SQL and /SQL*Plus?()
A、Both SQL and /SQL*plus allow manipulation of values in the database.
B、/SQL* Plus recognizes SQL satement and sends them to the server; SQL is the Oracle proprietary interface for executing SQL statements.
C、/SQL* Plus language for communicating with the Oracle server to access data; SQL recognizes SQL statements and sends them to the server.
D、/SQL manipulates data and table definition in the database; /SQL* Plus does not allow manipulation of values in the database.
下面选项中关于“文件指针”概念的叙述正确的是( )。
A、文件指针就是文件位置指针,表示当前读写数据的位置
B、文件指针是程序中用FILE定义的指针变量
C、文件指针指向文件在计算机中的存储位置
D、把文件指针传给fscanf函数,就可以向文本文件中写入任意的字符
您已经计划备份作业在晚上11点运行当您第二天回来的时候,发现作业在中途停止了您怎样确定在停止运行之前该作业完成了多少()
A、查看备份日志文件
B、手工检查文件和文件夹
C、在备份选项窗口中单击Verify(校验)选项
D、运行恢复实用工具
The user SCOTT executes the following command successfully to increase the salary values in one of his sessions: SQL> UPDATE emp SET sal=sal*1.15 WHERE deptno=20; Before SCOTT ends the transaction, user HR who has the privileges on EMP table executes a query to fetch the salary details but finds the old salary values instead of the increased values. Why does HR still see the old data?()
A、because of redo data from redo log file
B、because of data from database buffer cache
C、because of data from a temporary tablespace
D、because of undo data from the undo tablespace