Which of the following datatypes are used in situations where you want an ordered set of data elements, where every element is the same datatype, and where you predefine the number of elements that appear in the set?（）
A、REF
B、TABLE
C、CLOB
D、VARRAY
下列选项中不受我国著作权法保护的作品是（）。
A、计算机程序
B、Flash软件制作的动画
C、计算机文档
D、计算机软件保护条例
A new department is formed and a new section of the building is being built out for them. All 50 new employees will need access to the wireless network. Which of the following should be completed to allow these new employees access to the wireless network?（）
A、Frequency settings should be changed
B、Additional WAPs should be installed
C、Channels should be changed
D、VLANs should be added
软件商标权的保护对象是指（）。
A、商业软件
B、软件商标
C、软件注册商标
D、已使用的软件商标
Evaluate these two SQL statements: SELECT last_name, salary, hire_dateFROM EMPLOYEES ORDRE BY salary DESC; SELECT last_name, salary, hire_dateFROM EMPOLYEES ORDER BY 2 DESC; What is true about them? （）
A、The two statements produce identical results.
B、The second statement returns a syntax error.
C、There is no need to specify DESC because the results are sorted in descending order by default.
D、The two statements can be made to produce identical results by adding a column alias for the salary column in the second SQL statement.
Which of the following is a performance optimization technology?（）
A、QoS
B、Trunking
C、Spanning
D、VoIP
