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下列指令中有几条指令是不合法的（）。
①MOV[SI)，[DI]
②IN AL，DX
③JMP WORD PTR[BX]
④PUSH WORD PTR 10[BX+2]

一棵二叉树的先序、中序和后序序列分别如下，其中有一部分未显示出来，试指出下面（）图才是该二叉树。
先序序列：_B_P__ICEH_G；
中序序列：D_KFIA_EJC_；
后序序列：_K_FBHJ_C_A

对于无序接收的滑动窗口协议，若序号位数为n，则发送窗口最大尺寸为（）

求最短路径的FLOYD算法的时间复杂度为（）

One of the functions of the （） is to store the applications programs or the various secondaries. The （） may have similar or dissimilar functions. The same control code received from two different, secondaries may warrant two different actions on the part of the host computer. If the system so requires, the host computer must also provide （） for the centralized data and the software for database management. Data information is normally stored in auxiliary memories to which the computer has ready access. The （） peripherals connected to the host computer allow for human entry and intervention. As needs change, application programs may require additions, deletions, or changes. Data link problems also arise which are （） the range of the computer’s programmed capabilities. In such cases, human entry is required to make the necessary changes to resolve the existing problems.

Typically, these are concern with the establishment of （） the network and with the control of the flow of messages across this channel. The provision of such facilities is only part of the network requirements, however, since in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of （） interface between user(application)program, normally referred to, as application processes or APs, and the underlying communication services may be （） For example, one computer may be a small single -user computer, while another may be a large （） system. In the earlier days of computer communication, these issues meantthat only closed communities of computers ( that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network.
Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of Communication software packages produced by manufacturers to allow their systems to be int erconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, （） , in the late 1970s, formulated a reference model to provide a common basis ( or the coordination of standards developments and to allow existing and evolving standards activities to beplaced into perspective with one another.

视图是一种常用的数据对象，它是提供（38）和（38）数据的另一种途径，可以简化数据库操作，当使用多个数据表来建立视图时，表的连接不能使用（39）方式，并且不允许在该语句中包括（40）等关键字。

当X，Y之间是1对多联系时，则存在函数依赖（）；给定函数依赖f：X—＞Y和g：X—＞Y，则（）。

结构化查询语言SQL是一种（）语言，其主要功能有（），它的典型句型为
SELECT A1，A2，…，An
FROM r1，r2，…，rm
WHERE F
其中A1，A2，…，An、r1，r2，…，rm和F分别是（）。
关系模式SCS(Sno，Cno，Score)中，Sno是学生的学号，Cno是课程号，Score为成绩。若要查询每门课程的平均成绩，且要求查询结果按平均成绩升序排列。平均成绩相同时，按课程号降序排列，可用SQL语言写为（）。若查询结果仅限于平均分数超过85分的，则应（）。

在多媒体中记录音乐的文件格式常用的有WAVE、MP3和MIDI等。其中WAVE记录了音乐的（），MP3记录了（）的音乐，MIDI记录了（）。在用MPEG格式存储的图像序列中，不能随机恢复一幅图像的原因是它使用了（）技术，影响这种图像数据压缩比的主要因素是（）。

原型化方法是用户和设计者之间执行的一种交互构成，是一种（）型的设计过程，适用于（）系统。

结构化查询语言SQL是一种（）语言，其主要功能有（），它的典型句型为
SELECT A1，A2，…，An
FROM r1，r2，…，rm
WHERE F
其中A1，A2，…，An、r1，r2，…，rm和F分别是（）。
关系模式SCS(Sno，Cno，Score)中，Sno是学生的学号，Cno是课程号，Score为成绩。若要查询每门课程的平均成绩，且要求查询结果按平均成绩升序排列。平均成绩相同时，按课程号降序排列，可用SQL语言写为（）。若查询结果仅限于平均分数超过85分的，则应（）。

视图是一种常用的数据对象，它是提供（38）和（38）数据的另一种途径，可以简化数据库操作，当使用多个数据表来建立视图时，表的连接不能使用（39）方式，并且不允许在该语句中包括（40）等关键字。

Typically, these are concern with the establishment of （） the network and with the control of the flow of messages across this channel. The provision of such facilities is only part of the network requirements, however, since in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of （） interface between user(application)program, normally referred to, as application processes or APs, and the underlying communication services may be （） For example, one computer may be a small single -user computer, while another may be a large （） system. In the earlier days of computer communication, these issues meantthat only closed communities of computers ( that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network.
Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of Communication software packages produced by manufacturers to allow their systems to be int erconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, （） , in the late 1970s, formulated a reference model to provide a common basis ( or the coordination of standards developments and to allow existing and evolving standards activities to beplaced into perspective with one another.

One of the functions of the （） is to store the applications programs or the various secondaries. The （） may have similar or dissimilar functions. The same control code received from two different, secondaries may warrant two different actions on the part of the host computer. If the system so requires, the host computer must also provide （） for the centralized data and the software for database management. Data information is normally stored in auxiliary memories to which the computer has ready access. The （） peripherals connected to the host computer allow for human entry and intervention. As needs change, application programs may require additions, deletions, or changes. Data link problems also arise which are （） the range of the computer’s programmed capabilities. In such cases, human entry is required to make the necessary changes to resolve the existing problems.

在多媒体中记录音乐的文件格式常用的有WAVE、MP3和MIDI等。其中WAVE记录了音乐的（），MP3记录了（）的音乐，MIDI记录了（）。在用MPEG格式存储的图像序列中，不能随机恢复一幅图像的原因是它使用了（）技术，影响这种图像数据压缩比的主要因素是（）。

软件工程中，可行性研究要进行一次（）需求分析，系统流程图用于可行性分析中的（）的描述，系统流程图是描述（）的工具，（）工具在软件详细设计过程中不采用。

当X，Y之间是1对多联系时，则存在函数依赖（）；给定函数依赖f：X—＞Y和g：X—＞Y，则（）。

原型化方法是用户和设计者之间执行的一种交互构成，是一种（）型的设计过程，适用于（）系统。

结构化查询语言SQL是一种（）语言，其主要功能有（），它的典型句型为
SELECT A1，A2，…，An
FROM r1，r2，…，rm
WHERE F
其中A1，A2，…，An、r1，r2，…，rm和F分别是（）。
关系模式SCS(Sno，Cno，Score)中，Sno是学生的学号，Cno是课程号，Score为成绩。若要查询每门课程的平均成绩，且要求查询结果按平均成绩升序排列。平均成绩相同时，按课程号降序排列，可用SQL语言写为（）。若查询结果仅限于平均分数超过85分的，则应（）。

视图是一种常用的数据对象，它是提供（38）和（38）数据的另一种途径，可以简化数据库操作，当使用多个数据表来建立视图时，表的连接不能使用（39）方式，并且不允许在该语句中包括（40）等关键字。

Typically, these are concern with the establishment of （） the network and with the control of the flow of messages across this channel. The provision of such facilities is only part of the network requirements, however, since in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of （） interface between user(application)program, normally referred to, as application processes or APs, and the underlying communication services may be （） For example, one computer may be a small single -user computer, while another may be a large （） system. In the earlier days of computer communication, these issues meantthat only closed communities of computers ( that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network.
Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of Communication software packages produced by manufacturers to allow their systems to be int erconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, （） , in the late 1970s, formulated a reference model to provide a common basis ( or the coordination of standards developments and to allow existing and evolving standards activities to beplaced into perspective with one another.

在多媒体中记录音乐的文件格式常用的有WAVE、MP3和MIDI等。其中WAVE记录了音乐的（），MP3记录了（）的音乐，MIDI记录了（）。在用MPEG格式存储的图像序列中，不能随机恢复一幅图像的原因是它使用了（）技术，影响这种图像数据压缩比的主要因素是（）。

One of the functions of the （） is to store the applications programs or the various secondaries. The （） may have similar or dissimilar functions. The same control code received from two different, secondaries may warrant two different actions on the part of the host computer. If the system so requires, the host computer must also provide （） for the centralized data and the software for database management. Data information is normally stored in auxiliary memories to which the computer has ready access. The （） peripherals connected to the host computer allow for human entry and intervention. As needs change, application programs may require additions, deletions, or changes. Data link problems also arise which are （） the range of the computer’s programmed capabilities. In such cases, human entry is required to make the necessary changes to resolve the existing problems.

结构化查询语言SQL是一种（）语言，其主要功能有（），它的典型句型为
SELECT A1，A2，…，An
FROM r1，r2，…，rm
WHERE F
其中A1，A2，…，An、r1，r2，…，rm和F分别是（）。
关系模式SCS(Sno，Cno，Score)中，Sno是学生的学号，Cno是课程号，Score为成绩。若要查询每门课程的平均成绩，且要求查询结果按平均成绩升序排列。平均成绩相同时，按课程号降序排列，可用SQL语言写为（）。若查询结果仅限于平均分数超过85分的，则应（）。

Typically, these are concern with the establishment of （） the network and with the control of the flow of messages across this channel. The provision of such facilities is only part of the network requirements, however, since in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of （） interface between user(application)program, normally referred to, as application processes or APs, and the underlying communication services may be （） For example, one computer may be a small single -user computer, while another may be a large （） system. In the earlier days of computer communication, these issues meantthat only closed communities of computers ( that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network.
Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of Communication software packages produced by manufacturers to allow their systems to be int erconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, （） , in the late 1970s, formulated a reference model to provide a common basis ( or the coordination of standards developments and to allow existing and evolving standards activities to beplaced into perspective with one another.

在多媒体中记录音乐的文件格式常用的有WAVE、MP3和MIDI等。其中WAVE记录了音乐的（），MP3记录了（）的音乐，MIDI记录了（）。在用MPEG格式存储的图像序列中，不能随机恢复一幅图像的原因是它使用了（）技术，影响这种图像数据压缩比的主要因素是（）。

One of the functions of the （） is to store the applications programs or the various secondaries. The （） may have similar or dissimilar functions. The same control code received from two different, secondaries may warrant two different actions on the part of the host computer. If the system so requires, the host computer must also provide （） for the centralized data and the software for database management. Data information is normally stored in auxiliary memories to which the computer has ready access. The （） peripherals connected to the host computer allow for human entry and intervention. As needs change, application programs may require additions, deletions, or changes. Data link problems also arise which are （） the range of the computer’s programmed capabilities. In such cases, human entry is required to make the necessary changes to resolve the existing problems.

软件工程中，可行性研究要进行一次（）需求分析，系统流程图用于可行性分析中的（）的描述，系统流程图是描述（）的工具，（）工具在软件详细设计过程中不采用。

结构化查询语言SQL是一种（）语言，其主要功能有（），它的典型句型为
SELECT A1，A2，…，An
FROM r1，r2，…，rm
WHERE F
其中A1，A2，…，An、r1，r2，…，rm和F分别是（）。
关系模式SCS(Sno，Cno，Score)中，Sno是学生的学号，Cno是课程号，Score为成绩。若要查询每门课程的平均成绩，且要求查询结果按平均成绩升序排列。平均成绩相同时，按课程号降序排列，可用SQL语言写为（）。若查询结果仅限于平均分数超过85分的，则应（）。

Typically, these are concern with the establishment of （） the network and with the control of the flow of messages across this channel. The provision of such facilities is only part of the network requirements, however, since in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of （） interface between user(application)program, normally referred to, as application processes or APs, and the underlying communication services may be （） For example, one computer may be a small single -user computer, while another may be a large （） system. In the earlier days of computer communication, these issues meantthat only closed communities of computers ( that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM’s Systems Network.
Architecture (SNA) and DEC’s Digital Network Architecture (DNA) are just two examples of Communication software packages produced by manufacturers to allow their systems to be int erconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, （） , in the late 1970s, formulated a reference model to provide a common basis ( or the coordination of standards developments and to allow existing and evolving standards activities to beplaced into perspective with one another.

在多媒体中记录音乐的文件格式常用的有WAVE、MP3和MIDI等。其中WAVE记录了音乐的（），MP3记录了（）的音乐，MIDI记录了（）。在用MPEG格式存储的图像序列中，不能随机恢复一幅图像的原因是它使用了（）技术，影响这种图像数据压缩比的主要因素是（）。

One of the functions of the （） is to store the applications programs or the various secondaries. The （） may have similar or dissimilar functions. The same control code received from two different, secondaries may warrant two different actions on the part of the host computer. If the system so requires, the host computer must also provide （） for the centralized data and the software for database management. Data information is normally stored in auxiliary memories to which the computer has ready access. The （） peripherals connected to the host computer allow for human entry and intervention. As needs change, application programs may require additions, deletions, or changes. Data link problems also arise which are （） the range of the computer’s programmed capabilities. In such cases, human entry is required to make the necessary changes to resolve the existing problems.