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在关系代数运算中，若对表3-1按（），可以得到表3-2。

计算机各个功能部件之间的合作关系如图1-3所示。假设图中虚线表示控制流，实线表示数据流，那么，a、b、c分别表示（）

堆栈的访问方式是（），其中堆栈指针在数据入栈时（）。

已知3个类O、P和Q，类O中定义了一个私有方法F1、一个公有方法F2和一个受保护的方法F3：类P和类Q为类O的派生类，其继承方式如下所不： 
class P：protected O... 
class Q；public O… 
在关于方法F1的描述中正确的是（）。在关千方法F2的描述中正确的是（）。在关于方法F3的描述中正确的是（）。

设有员工实体Employee（employeeID，name，sex，age，tel，department），其中employeeID为员工号，name为员工姓名，sex为员工性别，age为员工年龄，tel为员工电话（要求记录该员工的手机号码和办公室电话），departID为员工所在部门号（要求参照另一部门实体Deparxment的主码depmtID）。 
Employee实体中存在的派生属性及其原因是（）；Employee实体中还存在多值属性，该属性及其该属性的处理为（）；对属性depaitmentID的约束是（）。

根据程序局部性理论，Denning提出了工作集理论。工作集是进程运行时被频繁访问的页面集合。在进程运行时，如果它的工作页面都在（）内，能够使进程有效地运行，否则会出现频繁的页面调入/调出现象。 
假设窗口尺寸为10，在某一段时间内，进程所访问的逻辑页面顺序如图6-4所示，那么在t1时刻的工作集是（）。

Windows NT或Windows 2000是当前流行的一类操作系统，（）是WindowsNT真正的中心，它提供了一组操作系统原语和机制。Windows NT采用线程机制来提高系统的（）。NT采用基于（）的方案选定线程执行的次序。

Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to （） fraudulent Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".
In phishing, the perpetrator sends out legitimate- （） looking e-malls, appearing to come from some of the Web’s most popular sites, in an effort to obtain personal and financial information from individual recipients. But in pharming, larger numbers of computer users can be （） victimized because it is not necessary to target individuals one by one and no conscious action is required on the part of the victim. In one form of pharming attack, code sent in an e-mail modifies local host files on a personal computer. The host files convert URLs into the number strings that the computer uses to access Web sites. A computer with a compromised host file will go to the fake Web site even if a user types in the correct Internet address or clicks on an affected （） bookmark entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing（）

下列要素中，不属于DFD的是（）。当使用DFD对一个工资系统进行建模时，（）可以被认定为外部实体。

风险分析在软件项目开发中具有重要作用，包括风险识别、风险预测、风险评估和风险控制等。“建立风险条目检查表”是（）时的活动，“描述风险的结果”是（）时的活动。

某Web网站向CA申请了数字证书。用户登录该网站时，通过验证（），可确认该数字证书的有效性，从而（）。

堆栈的访问方式是（），其中堆栈指针在数据入栈时（）。

根据程序局部性理论，Denning提出了工作集理论。工作集是进程运行时被频繁访问的页面集合。在进程运行时，如果它的工作页面都在（）内，能够使进程有效地运行，否则会出现频繁的页面调入/调出现象。 
假设窗口尺寸为10，在某一段时间内，进程所访问的逻辑页面顺序如图6-4所示，那么在t1时刻的工作集是（）。

假设窗口尺寸为10，在某一段时间内，进程所访问的逻辑页面顺序如图2-2所示，那么在t₁时刻的工作集是（）。

已知3个类O、P和Q，类O中定义了一个私有方法F1、一个公有方法F2和一个受保护的方法F3：类P和类Q为类O的派生类，其继承方式如下所不： 
class P：protected O... 
class Q；public O… 
在关于方法F1的描述中正确的是（）。在关千方法F2的描述中正确的是（）。在关于方法F3的描述中正确的是（）。

风险分析在软件项目开发中具有重要作用，包括风险识别、风险预测、风险评估和风险控制等。“建立风险条目检查表”是（）时的活动，“描述风险的结果”是（）时的活动。

下列要素中，不属于DFD的是（）。当使用DFD对一个工资系统进行建模时，（）可以被认定为外部实体。

某Web网站向CA申请了数字证书。用户登录该网站时，通过验证（），可确认该数字证书的有效性，从而（）。

Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to （） fraudulent Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".
In phishing, the perpetrator sends out legitimate- （） looking e-malls, appearing to come from some of the Web’s most popular sites, in an effort to obtain personal and financial information from individual recipients. But in pharming, larger numbers of computer users can be （） victimized because it is not necessary to target individuals one by one and no conscious action is required on the part of the victim. In one form of pharming attack, code sent in an e-mail modifies local host files on a personal computer. The host files convert URLs into the number strings that the computer uses to access Web sites. A computer with a compromised host file will go to the fake Web site even if a user types in the correct Internet address or clicks on an affected （） bookmark entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing（）

Windows NT或Windows 2000是当前流行的一类操作系统，（）是WindowsNT真正的中心，它提供了一组操作系统原语和机制。Windows NT采用线程机制来提高系统的（）。NT采用基于（）的方案选定线程执行的次序。

设有员工实体Employee（employeeID，name，sex，age，tel，department），其中employeeID为员工号，name为员工姓名，sex为员工性别，age为员工年龄，tel为员工电话（要求记录该员工的手机号码和办公室电话），departID为员工所在部门号（要求参照另一部门实体Deparxment的主码depmtID）。 
Employee实体中存在的派生属性及其原因是（）；Employee实体中还存在多值属性，该属性及其该属性的处理为（）；对属性depaitmentID的约束是（）。

已知3个类O、P和Q，类O中定义了一个私有方法F1、一个公有方法F2和一个受保护的方法F3：类P和类Q为类O的派生类，其继承方式如下所不： 
class P：protected O... 
class Q；public O… 
在关于方法F1的描述中正确的是（）。在关千方法F2的描述中正确的是（）。在关于方法F3的描述中正确的是（）。

Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to （） fraudulent Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".
In phishing, the perpetrator sends out legitimate- （） looking e-malls, appearing to come from some of the Web’s most popular sites, in an effort to obtain personal and financial information from individual recipients. But in pharming, larger numbers of computer users can be （） victimized because it is not necessary to target individuals one by one and no conscious action is required on the part of the victim. In one form of pharming attack, code sent in an e-mail modifies local host files on a personal computer. The host files convert URLs into the number strings that the computer uses to access Web sites. A computer with a compromised host file will go to the fake Web site even if a user types in the correct Internet address or clicks on an affected （） bookmark entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing（）

The ARPANET （） ( the rules of syntax that enable computers to communicate on a network) were originally designed for openness and flexibility, not for （） The ARPA researchers needed to share information easily, so everyone needed to be an unrestricted "insider" on the network. Although the approach was appropriate at the time, it is not one that lends itself to today’s commercial and government use.
As more locations with computers (known as （） in Internet parlance)joined the ARPANET, the usefulness of the network grew. The ARPANET consisted primarily of university and government computers, and the applications supported on this network were simple: electronic mail ( E - mail), electronic news groups, and （） connection to other computers. By 1971, the Internet linked about two dozen research and government sites, and researchers had begun to use it to exchange （） not directly related to the ARPANET itself. The network was becoming an important tool for collaborative research.

Even though current technologies make the ultimate segmented network impractical, new technologies and products hold the promise of making the concept a reality. Most important of all these new technologies are （） . The ultimate switched LAN, which is technically possible, now, exhibits the following characteristics:
1. High-speed yet cost-effective switching devices can be implemented on a wide scale, providing dedicated connections for individual users and supporting the aggregate （） of all networked users.
2. The ability to deploy switching capabilities incrementally into the （） base. Switching implementations support switching of individual users or groups so that existing users of shared media modules can continue to use the existing equipment until they can justify moving to dedicate switched LAN connections.
3. Support and enhancement of existing routed environments. Switching （） routint, but rather can be introduced into the network without making any changes to the existing routing equipment or configuration. （） play a critical role in the integration of switching into existing networks.

Windows NT或Windows 2000是当前流行的一类操作系统，（）是WindowsNT真正的中心，它提供了一组操作系统原语和机制。Windows NT采用线程机制来提高系统的（）。NT采用基于（）的方案选定线程执行的次序。

设有员工实体Employee（employeeID，name，sex，age，tel，department），其中employeeID为员工号，name为员工姓名，sex为员工性别，age为员工年龄，tel为员工电话（要求记录该员工的手机号码和办公室电话），departID为员工所在部门号（要求参照另一部门实体Deparxment的主码depmtID）。 
Employee实体中存在的派生属性及其原因是（）；Employee实体中还存在多值属性，该属性及其该属性的处理为（）；对属性depaitmentID的约束是（）。

System analysis is traditionally done top-down using structured analysis based on （） ．Object-oriented analysis focuses on creation of models．The three types of the analysis model are （） ．There are two substages of object-oriented analysis． （） focuses on real-world things whose semantics the application captures．The object constructed in the requirement analysis shows the （） of the real-world system and organizes it into workable pieces． （） addresses the computer aspects ofthe application that are visible to users．The objects are those which can be expected to vary from time to time quite rapidly．

The ARPANET （） ( the rules of syntax that enable computers to communicate on a network) were originally designed for openness and flexibility, not for （） The ARPA researchers needed to share information easily, so everyone needed to be an unrestricted "insider" on the network. Although the approach was appropriate at the time, it is not one that lends itself to today’s commercial and government use.
As more locations with computers (known as （） in Internet parlance)joined the ARPANET, the usefulness of the network grew. The ARPANET consisted primarily of university and government computers, and the applications supported on this network were simple: electronic mail ( E - mail), electronic news groups, and （） connection to other computers. By 1971, the Internet linked about two dozen research and government sites, and researchers had begun to use it to exchange （） not directly related to the ARPANET itself. The network was becoming an important tool for collaborative research.

Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to （） fraudulent Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".
In phishing, the perpetrator sends out legitimate- （） looking e-malls, appearing to come from some of the Web’s most popular sites, in an effort to obtain personal and financial information from individual recipients. But in pharming, larger numbers of computer users can be （） victimized because it is not necessary to target individuals one by one and no conscious action is required on the part of the victim. In one form of pharming attack, code sent in an e-mail modifies local host files on a personal computer. The host files convert URLs into the number strings that the computer uses to access Web sites. A computer with a compromised host file will go to the fake Web site even if a user types in the correct Internet address or clicks on an affected （） bookmark entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing（）

Even though current technologies make the ultimate segmented network impractical, new technologies and products hold the promise of making the concept a reality. Most important of all these new technologies are （） . The ultimate switched LAN, which is technically possible, now, exhibits the following characteristics:
1. High-speed yet cost-effective switching devices can be implemented on a wide scale, providing dedicated connections for individual users and supporting the aggregate （） of all networked users.
2. The ability to deploy switching capabilities incrementally into the （） base. Switching implementations support switching of individual users or groups so that existing users of shared media modules can continue to use the existing equipment until they can justify moving to dedicate switched LAN connections.
3. Support and enhancement of existing routed environments. Switching （） routint, but rather can be introduced into the network without making any changes to the existing routing equipment or configuration. （） play a critical role in the integration of switching into existing networks.

System analysis is traditionally done top-down using structured analysis based on （） ．Object-oriented analysis focuses on creation of models．The three types of the analysis model are （） ．There are two substages of object-oriented analysis． （） focuses on real-world things whose semantics the application captures．The object constructed in the requirement analysis shows the （） of the real-world system and organizes it into workable pieces． （） addresses the computer aspects ofthe application that are visible to users．The objects are those which can be expected to vary from time to time quite rapidly．

The ARPANET （） ( the rules of syntax that enable computers to communicate on a network) were originally designed for openness and flexibility, not for （） The ARPA researchers needed to share information easily, so everyone needed to be an unrestricted "insider" on the network. Although the approach was appropriate at the time, it is not one that lends itself to today’s commercial and government use.
As more locations with computers (known as （） in Internet parlance)joined the ARPANET, the usefulness of the network grew. The ARPANET consisted primarily of university and government computers, and the applications supported on this network were simple: electronic mail ( E - mail), electronic news groups, and （） connection to other computers. By 1971, the Internet linked about two dozen research and government sites, and researchers had begun to use it to exchange （） not directly related to the ARPANET itself. The network was becoming an important tool for collaborative research.

Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to （） fraudulent Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".
In phishing, the perpetrator sends out legitimate- （） looking e-malls, appearing to come from some of the Web’s most popular sites, in an effort to obtain personal and financial information from individual recipients. But in pharming, larger numbers of computer users can be （） victimized because it is not necessary to target individuals one by one and no conscious action is required on the part of the victim. In one form of pharming attack, code sent in an e-mail modifies local host files on a personal computer. The host files convert URLs into the number strings that the computer uses to access Web sites. A computer with a compromised host file will go to the fake Web site even if a user types in the correct Internet address or clicks on an affected （） bookmark entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing（）

Even though current technologies make the ultimate segmented network impractical, new technologies and products hold the promise of making the concept a reality. Most important of all these new technologies are （） . The ultimate switched LAN, which is technically possible, now, exhibits the following characteristics:
1. High-speed yet cost-effective switching devices can be implemented on a wide scale, providing dedicated connections for individual users and supporting the aggregate （） of all networked users.
2. The ability to deploy switching capabilities incrementally into the （） base. Switching implementations support switching of individual users or groups so that existing users of shared media modules can continue to use the existing equipment until they can justify moving to dedicate switched LAN connections.
3. Support and enhancement of existing routed environments. Switching （） routint, but rather can be introduced into the network without making any changes to the existing routing equipment or configuration. （） play a critical role in the integration of switching into existing networks.

System analysis is traditionally done top-down using structured analysis based on （） ．Object-oriented analysis focuses on creation of models．The three types of the analysis model are （） ．There are two substages of object-oriented analysis． （） focuses on real-world things whose semantics the application captures．The object constructed in the requirement analysis shows the （） of the real-world system and organizes it into workable pieces． （） addresses the computer aspects ofthe application that are visible to users．The objects are those which can be expected to vary from time to time quite rapidly．

The ARPANET （） ( the rules of syntax that enable computers to communicate on a network) were originally designed for openness and flexibility, not for （） The ARPA researchers needed to share information easily, so everyone needed to be an unrestricted "insider" on the network. Although the approach was appropriate at the time, it is not one that lends itself to today’s commercial and government use.
As more locations with computers (known as （） in Internet parlance)joined the ARPANET, the usefulness of the network grew. The ARPANET consisted primarily of university and government computers, and the applications supported on this network were simple: electronic mail ( E - mail), electronic news groups, and （） connection to other computers. By 1971, the Internet linked about two dozen research and government sites, and researchers had begun to use it to exchange （） not directly related to the ARPANET itself. The network was becoming an important tool for collaborative research.

System analysis is traditionally done top-down using structured analysis based on （） ．Object-oriented analysis focuses on creation of models．The three types of the analysis model are （） ．There are two substages of object-oriented analysis． （） focuses on real-world things whose semantics the application captures．The object constructed in the requirement analysis shows the （） of the real-world system and organizes it into workable pieces． （） addresses the computer aspects ofthe application that are visible to users．The objects are those which can be expected to vary from time to time quite rapidly．

Even though current technologies make the ultimate segmented network impractical, new technologies and products hold the promise of making the concept a reality. Most important of all these new technologies are （） . The ultimate switched LAN, which is technically possible, now, exhibits the following characteristics:
1. High-speed yet cost-effective switching devices can be implemented on a wide scale, providing dedicated connections for individual users and supporting the aggregate （） of all networked users.
2. The ability to deploy switching capabilities incrementally into the （） base. Switching implementations support switching of individual users or groups so that existing users of shared media modules can continue to use the existing equipment until they can justify moving to dedicate switched LAN connections.
3. Support and enhancement of existing routed environments. Switching （） routint, but rather can be introduced into the network without making any changes to the existing routing equipment or configuration. （） play a critical role in the integration of switching into existing networks.

The ARPANET （） ( the rules of syntax that enable computers to communicate on a network) were originally designed for openness and flexibility, not for （） The ARPA researchers needed to share information easily, so everyone needed to be an unrestricted "insider" on the network. Although the approach was appropriate at the time, it is not one that lends itself to today’s commercial and government use.
As more locations with computers (known as （） in Internet parlance)joined the ARPANET, the usefulness of the network grew. The ARPANET consisted primarily of university and government computers, and the applications supported on this network were simple: electronic mail ( E - mail), electronic news groups, and （） connection to other computers. By 1971, the Internet linked about two dozen research and government sites, and researchers had begun to use it to exchange （） not directly related to the ARPANET itself. The network was becoming an important tool for collaborative research.

Even though current technologies make the ultimate segmented network impractical, new technologies and products hold the promise of making the concept a reality. Most important of all these new technologies are （） . The ultimate switched LAN, which is technically possible, now, exhibits the following characteristics:
1. High-speed yet cost-effective switching devices can be implemented on a wide scale, providing dedicated connections for individual users and supporting the aggregate （） of all networked users.
2. The ability to deploy switching capabilities incrementally into the （） base. Switching implementations support switching of individual users or groups so that existing users of shared media modules can continue to use the existing equipment until they can justify moving to dedicate switched LAN connections.
3. Support and enhancement of existing routed environments. Switching （） routint, but rather can be introduced into the network without making any changes to the existing routing equipment or configuration. （） play a critical role in the integration of switching into existing networks.

System analysis is traditionally done top-down using structured analysis based on （） ．Object-oriented analysis focuses on creation of models．The three types of the analysis model are （） ．There are two substages of object-oriented analysis． （） focuses on real-world things whose semantics the application captures．The object constructed in the requirement analysis shows the （） of the real-world system and organizes it into workable pieces． （） addresses the computer aspects ofthe application that are visible to users．The objects are those which can be expected to vary from time to time quite rapidly．