TCP/IP模型由低到高可分为________四个层次。

单项选择题

数据库数据字典由 1 组成，它 2 。

A．关系和操作
B．数据、关系和操作
C．基本表和用户可存取的视图
D．系统人员可存取的数据和用户可存取的视图

单项选择题

现有一个空栈，栈顶指针为100H，现有输入序列为A、B、C、D、E，经过操作push，push， pop，push，pop，push后，输出的序列为 6 ，此时栈顶的指针为 7 。

A．B、C
B．A、B
C．A、C
D．B、D

单项选择题

SQL语句“平均成绩BETWEEN 80.0 AND 90.0”表示 ________ 。

A．平均成绩＞80.0 AND平均成绩＜90.0
B．平均成绩＜80.0 OR平均成绩＞90.0
C．平均成绩＞=80.0 AND平均成绩＜=90.0
D．平均成绩＜=80.0 OR平均成绩＞=90.0

单项选择题

CMM(Capability Maturity Model)是由美国国防部DOD指定CMU的软件工程研究所SEI研究出来的一套过程规范，它将软件过程的成熟度分为 ________ 。

A．Initial, Defined, Managed, Repeatable, Optimizing
B．Initial, Repeatable, Managed, Defined, Optimizing
C．Initial, Repeatable, Defined, Managed, Optimizing
D．Initial, Managed, Defined, Repeatable, Optimizing

单项选择题

Email收件人的标识即Email地址，它具有，地址中。

A．唯一确定性可以有空格
B．唯一确定性无空格
C．不唯一性可以有空格
D．不唯—性无空格

单项选择题

已知有关系“STUDENT”，则关系运算σ _ANE＜80 (STUDENT)用SQL语句表示为 ________ 。

A．SELECT( * )FROM STUDENT WHERE AVE ＜ 80
B．SELECT( * ) FROM STUDENT HAVING AVE ＜ 80
C．SELECT(AVE. FROM STUDENT WHERE AVE ＜ 80
D．SELECT(AVE） FROM STUDENT HAVING AVE ＜ 80

单项选择题

现有一个空栈，栈顶指针为100H，现有输入序列为A、B、C、D、E，经过操作push，push， pop，push，pop，push后，输出的序列为 6 ，此时栈顶的指针为 7 。

A．100H
B．101H
C．102H
D．103H

单项选择题

欲将表“学生”中的信息先按学号升序排序，再按平均成绩升序排列，其正确命令是 ________ 。

院系号

学号

姓名

性别

平均成绩

001
003
002
003
002
004
001

0013052
0030102
0022007
0031721
0023054
0042158
0015116

学生A
学生B
学生C
学生D
学生E
学生F
学生G

女
男
女
女
男
女
男

82.5
77.0
90.0
73.5
88.5
85.0
87.0

A．SELECT * FROM 学生 ORDER BY 学号 ASC，平均成绩 ASC
B．SELECT * FROM 学生 ORDER BY 平均成绩 ASC，学号 ASC
C．SELECT * FROM 学生 ORDER BY 学号 DESC，平均成绩 DESC
D．SELECT * FROM 学生 ORDER BY 平均成绩 DESC，学号 DESC

单项选择题

数据库系统软件包括 ________ 。

A．数据库和操作系统
B．数据库和相应的开发工具
C．数据库管理系统和数据库应用系统
D．数据库管理系统，数据库应用系统及相应的开发工具

单项选择题

设某磁带的有效磁带长为200m，记录的块系数为2，块间的间隔为10mm，记录长为100 (byte)，记录的密度为80(byte/mm)。将该磁带用于记录某种卡片(100byte)，则磁带上能记录的卡片数可为 ________ 。

A．160
B．320
C．1.6万
D．3.2万

单项选择题

由于学号(SN)为00291的学生已毕业，欲在关系“Student”中删除该学生的所有信息，用元组关系演算语言实现应为 ________ 。

A．GET W (Student): Student. SN = 00291"DELETE W
B．GET W: Student. SN = 00291"in StudentDELETE W
C．HOLD W (student): Student. SN = 00291"DELETE W
D．HOLD W: Student. SN = 00291"in StudentDELETE W

单项选择题

Sometimes the processes in which people are engaged are dependent upon other processes being completed first, possibly by other people. For example, on an automobile 30 , it is necessary for the body to be constructed before the doors can be added on. Attempting to add the doors first would be pointless, because there would be nowhere to attach them. Thus, if there is no body ready to have doors added, the process for adding doors has to be 31 until the process for creating the next body is complete. This is known as 32
Obviously, there are many cases where people have to wait for other people to do something. However, if everyone in such a situation is waiting for someone else to do something first, then no one will ever be able to do anything. When discussing processes, this situation is known as 33 , because all of the involved processes are effectively dead because of locks they have on resources. Usually someone in such a situation will eventually notice and abort the process, allowing normal flow to 34 , and often warning signs can even be spotted ahead of time to avoid "it in the first place.

A．water thread
B．assembly thread
C．water line
D．assembly line

单项选择题

Sometimes the processes in which people are engaged are dependent upon other processes being completed first, possibly by other people. For example, on an automobile 30 , it is necessary for the body to be constructed before the doors can be added on. Attempting to add the doors first would be pointless, because there would be nowhere to attach them. Thus, if there is no body ready to have doors added, the process for adding doors has to be 31 until the process for creating the next body is complete. This is known as 32
Obviously, there are many cases where people have to wait for other people to do something. However, if everyone in such a situation is waiting for someone else to do something first, then no one will ever be able to do anything. When discussing processes, this situation is known as 33 , because all of the involved processes are effectively dead because of locks they have on resources. Usually someone in such a situation will eventually notice and abort the process, allowing normal flow to 34 , and often warning signs can even be spotted ahead of time to avoid "it in the first place.

A．suspended
B．broken
C．hung
D．hold

单项选择题

Sometimes the processes in which people are engaged are dependent upon other processes being completed first, possibly by other people. For example, on an automobile 30 , it is necessary for the body to be constructed before the doors can be added on. Attempting to add the doors first would be pointless, because there would be nowhere to attach them. Thus, if there is no body ready to have doors added, the process for adding doors has to be 31 until the process for creating the next body is complete. This is known as 32
Obviously, there are many cases where people have to wait for other people to do something. However, if everyone in such a situation is waiting for someone else to do something first, then no one will ever be able to do anything. When discussing processes, this situation is known as 33 , because all of the involved processes are effectively dead because of locks they have on resources. Usually someone in such a situation will eventually notice and abort the process, allowing normal flow to 34 , and often warning signs can even be spotted ahead of time to avoid "it in the first place.

A．timing
B．synchronization
C．contemporary
D．simultaneity

单项选择题

在VFP的命令窗口中进行日期的设置，要求以MM-DD-YY形式显示日期“11-15- 05”，应使用命令 ________ 。

A．SET DATE TO MDY DATE()&&显示"11-15-05"
B．SET DATE TO MDYDATE( )&& ,显示" 11 - 15 -05"
C．SET DATE TO MDY DATE( )显示" 11 - 15 -05"
D．SET DATE TO MDY DATE ( ) 显示" 11 - 15 - 05"

单项选择题

Sometimes the processes in which people are engaged are dependent upon other processes being completed first, possibly by other people. For example, on an automobile 30 , it is necessary for the body to be constructed before the doors can be added on. Attempting to add the doors first would be pointless, because there would be nowhere to attach them. Thus, if there is no body ready to have doors added, the process for adding doors has to be 31 until the process for creating the next body is complete. This is known as 32
Obviously, there are many cases where people have to wait for other people to do something. However, if everyone in such a situation is waiting for someone else to do something first, then no one will ever be able to do anything. When discussing processes, this situation is known as 33 , because all of the involved processes are effectively dead because of locks they have on resources. Usually someone in such a situation will eventually notice and abort the process, allowing normal flow to 34 , and often warning signs can even be spotted ahead of time to avoid "it in the first place.

A．waiting lock
B．block
C．deadlock
D．death

单项选择题

TCP/IP模型由低到高可分为 ________ 四个层次。

A．网络接口层，网际层，传输层，应用层
B．网络接口层，链路层，传输层，应用层
C．物理层，链路层，传输层，应用层
D．网络接口层，会话层，传输层，应用层

单项选择题

在以下各种转换和映象中，应用程序可实现的是 37 ；数据库管理系统(DBMS)可实现的是 38 。

A．模式与子模式之间的映象
B．内模式与外模式之间的映象
C．存储模式与数据物理组织之间的映象
D．从外部视图到子模式的数据结构的转换

单项选择题

Sometimes the processes in which people are engaged are dependent upon other processes being completed first, possibly by other people. For example, on an automobile 30 , it is necessary for the body to be constructed before the doors can be added on. Attempting to add the doors first would be pointless, because there would be nowhere to attach them. Thus, if there is no body ready to have doors added, the process for adding doors has to be 31 until the process for creating the next body is complete. This is known as 32
Obviously, there are many cases where people have to wait for other people to do something. However, if everyone in such a situation is waiting for someone else to do something first, then no one will ever be able to do anything. When discussing processes, this situation is known as 33 , because all of the involved processes are effectively dead because of locks they have on resources. Usually someone in such a situation will eventually notice and abort the process, allowing normal flow to 34 , and often warning signs can even be spotted ahead of time to avoid "it in the first place.

A．begin
B．resume
C．presume
D．take back

单项选择题

在以下各种转换和映象中，应用程序可实现的是 37 ；数据库管理系统(DBMS)可实现的是 38 。

A．模式与子模式之间的映象
B．内模式与外模式之间的映象
C．存储模式与数据物理组织之间的映象
D．从外部视图到子模式的数据结构的转换

院系号	学号	姓名	性别	平均成绩
001 003 002 003 002 004 001	0013052 0030102 0022007 0031721 0023054 0042158 0015116	学生A 学生B 学生C 学生D 学生E 学生F 学生G	女男女女男女男	82.5 77.0 90.0 73.5 88.5 85.0 87.0

TCP/IP模型由低到高可分为 ________ 四个层次。

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