使用自动填充方法输入数据时，若在A1输入2，A2输入4，然后选中A1：A2区域，再拖动填充柄至A10，则A1：A10区域内各单元格填充的数据为（）。

A、2，4，6，„，20

B、全0

C、全2

D、全4

在用户网光纤化的方案中，（）是光纤到路边的缩写。

A、FTTH

B、FTTF

C、FTTO

D、FTTC

关于系统特征的表述，不正确的是（）。

A、目的性

B、整体性

C、层次性

D、不相干涉性

计算机系统包括硬件系统和软件系统，其中软件系统包括：（）。

A、系统软件

B、打印机

C、服务器

D、应用软件

E、运算器和控制器

What is true about sequences?（）

A、Once created, a sequence belongs to a specific schema.

B、Once created, a sequence is linked to a specific table.

C、Once created, a sequence is automatically available to all users.

D、Only the DBA can control which sequence is used by a certain table.

E、Once created, a sequence is automatically used in all INSERT and UPDATE statements.

Examine the structure of the STUDENTS table: STUDENT_ID NUMBER NOT NULL, Primary Key STUDENT_NAME VARCHAR2(30) COURSE_ID VARCHAR2(10) NOT NULL MARKS NUMBER START_DATE DATE FINISH_DATE DATE You need to create a report of the 10 students who achieved the highest ranking in the course INT SQL and who completed the course in the year 1999. Which SQL statement accomplishes this task? （）

A、SELECT student_ id, marks, ROWNUM Rank FROM students WHERE ROWNUM <= 10 AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99 AND course_id = 'INT_SQL' ORDER BY mark DESC;

B、SELECT student_id, marks, ROWID Rank FROM students WHERE ROWID <= 10 AND finish_date BETWEEN '01-JAN-99' AND '31-DEC-99' AND course_id = 'INT_SQL' ORDER BY mark;

C、SELECT student_id, marks, ROWNUM Rank FROM (SELECT student_id, marks FROM students WHERE ROWNUM <= 10 AND finish_date BETWEEN '01-JAN-99' AND '31-DEC- 99' AND course_id = 'INT_SQL' ORDER BY mark DESC;

D、SELECT student_id, marks, ROWNUM Rank FROM (SELECT student_id, marks FROM students WHERE (finish_date BETWEEN '01-JAN-99 AND '31-DEC-99' AND course_id = 'INT_SQL' ORDER BY marks DESC) WHERE ROWNUM <= 10;

E、SELECT student id, marks, ROWNUM Rank FROM (SELECT student_id, marks FROM students ORDER BY marks) WHERE ROWNUM <= 10 AND finish date BETWEEN '01-JAN-99' AND '31-DEC-99' AND course _ id 'INT_SQL';