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下图所示的防火墙结构属于（）

进程PA不断地向管道写数据，进程PB从管道中读数据并加工处理，如下图所示。如果采用PV操作来实现进程PA和进程PB间的管道通信，并且保证这两个进程并发执行的正确性，则至少需要（）。

关系代数表达式R×S÷T－U的运算结果是（）。

设有关系R、S和T如下图所示，则元组演算表达式的运算结果是（）

虚拟存储管理系统的基础是程序的（）理论，这个理论的基本含义是指程序执行时往往会不均匀地访问主存储器单元。根据这个理论，Denning提出了工作集理论。工作集是进程运行时被频繁地访问的页面集合。在进程运行时，如果它的工作集页面都在（）内，能够使该进程有效地运行，否则会出现频繁的页面调入/调出现象。

内存按字节编址，地址从A4000H到CBFFFH，共有（）字节。若用存储容量为32K×8bit的存储器芯片构成该内存，至少需要（）片。

假设系统中有三类互斥资源R1、R2 和R3，可用资源数分别为9、8 和5。在T0 时刻系统中有P1、P2、P3、P4 和P5 五个进程，这些进程对资源的最大需求量和已分配资源数如下表所示。此时系统剩余的可用资源数分别为（）。如果进程按 （） 序列执行，那么系统状态是安全的。

容量为64块的Cache采用组相联方式映像，字块大小为128个字，每4块为一组。若主存容量为4096块，且以字编址，那么主存地址应为（）位，主存区号应为（）位。

关系模式R（U，F），其中U={W，X，Y，Z}，F={WX→Y，W→X，X→Z，Y→W}。关系模式R的候选键是（），（）是无损连接并保持函数依赖的分解。

在UML提供的图中，可以采用（）对逻辑数据库模式建模；（）用于接口、类和协作的行为建模，并强调对象行为的事件顺序；（）用于系统的功能建模，并强调对象间的控制流。

某一非确定性有限自动机（NFA）的状态转换图如下图所示，与该NFA 等价的正规式是 （） ，与该NFA 等价的DFA 是 （） 。

假定每一车次具有唯一的始发站和终点站。如果实体“列车时刻表”属性为车次、始发站、发车时间、终点站、到达时间，该实体的主键是（）；如果实体“列车运行表”属性为车次、日期、发车时间、到达时间，该实体的主键是（）。通常情况下，上述“列车时刻表”和“列车运行表”两实体型间（）联系。

许多网络通信需要进行组播，以下选项中不采用组播协议的应用是（）。在IPv4中把（）类地址作为组播地址。

容量为64块的Cache采用组相联方式映像，字块大小为128个字，每4块为一组。若主存容量为4096块，且以字编址，那么主存地址应为（）位，主存区号应为（）位。

内存按字节编址，地址从A4000H到CBFFFH，共有（）字节。若用存储容量为32K×8bit的存储器芯片构成该内存，至少需要（）片。

虚拟存储管理系统的基础是程序的（）理论，这个理论的基本含义是指程序执行时往往会不均匀地访问主存储器单元。根据这个理论，Denning提出了工作集理论。工作集是进程运行时被频繁地访问的页面集合。在进程运行时，如果它的工作集页面都在（）内，能够使该进程有效地运行，否则会出现频繁的页面调入/调出现象。

假设系统中有三类互斥资源R1、R2 和R3，可用资源数分别为9、8 和5。在T0 时刻系统中有P1、P2、P3、P4 和P5 五个进程，这些进程对资源的最大需求量和已分配资源数如下表所示。此时系统剩余的可用资源数分别为（）。如果进程按 （） 序列执行，那么系统状态是安全的。

关系模式R（U，F），其中U={W，X，Y，Z}，F={WX→Y，W→X，X→Z，Y→W}。关系模式R的候选键是（），（）是无损连接并保持函数依赖的分解。

假定每一车次具有唯一的始发站和终点站。如果实体“列车时刻表”属性为车次、始发站、发车时间、终点站、到达时间，该实体的主键是（）；如果实体“列车运行表”属性为车次、日期、发车时间、到达时间，该实体的主键是（）。通常情况下，上述“列车时刻表”和“列车运行表”两实体型间（）联系。

在UML提供的图中，可以采用（）对逻辑数据库模式建模；（）用于接口、类和协作的行为建模，并强调对象行为的事件顺序；（）用于系统的功能建模，并强调对象间的控制流。

许多网络通信需要进行组播，以下选项中不采用组播协议的应用是（）。在IPv4中把（）类地址作为组播地址。

某一非确定性有限自动机（NFA）的状态转换图如下图所示，与该NFA 等价的正规式是 （） ，与该NFA 等价的DFA 是 （） 。

假定每一车次具有唯一的始发站和终点站。如果实体“列车时刻表”属性为车次、始发站、发车时间、终点站、到达时间，该实体的主键是（）；如果实体“列车运行表”属性为车次、日期、发车时间、到达时间，该实体的主键是（）。通常情况下，上述“列车时刻表”和“列车运行表”两实体型间（）联系。

在UML提供的图中，可以采用（）对逻辑数据库模式建模；（）用于接口、类和协作的行为建模，并强调对象行为的事件顺序；（）用于系统的功能建模，并强调对象间的控制流。

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （） or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept （） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have （） network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message （） . As an example, gateways between Internet e-mail and X.400 e-mail must （） the e-mail message and change various header fields.

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable （） of the technical requirements for the software product. During the requirements definition phase, the requirements definition team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each （） that it must meet. The starting point is usually a set of high-level requirements from the （） that describe the project or problem. In either case, the requirements definition team formulates an overall concept for the system and then defines （） showing how the system will be operated, publishes the system and operations concept document, and conducts a system concept review(SCR). Following the SCR, the team derives （） requirements for the system from the high level requirements and the system and operations concept. Using structured or object-oriented analysis, the team specifies the software functions and algorithms needed to satisfy each detailed requirement.

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （） or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept （） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have （） network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message （） . As an example, gateways between Internet e-mail and X.400 e-mail must （） the e-mail message and change various header fields.

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable （） of the technical requirements for the software product. During the requirements definition phase, the requirements definition team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each （） that it must meet. The starting point is usually a set of high-level requirements from the （） that describe the project or problem. In either case, the requirements definition team formulates an overall concept for the system and then defines （） showing how the system will be operated, publishes the system and operations concept document, and conducts a system concept review(SCR). Following the SCR, the team derives （） requirements for the system from the high level requirements and the system and operations concept. Using structured or object-oriented analysis, the team specifies the software functions and algorithms needed to satisfy each detailed requirement.

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （） or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept （） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have （） network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message （） . As an example, gateways between Internet e-mail and X.400 e-mail must （） the e-mail message and change various header fields.

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable （） of the technical requirements for the software product. During the requirements definition phase, the requirements definition team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each （） that it must meet. The starting point is usually a set of high-level requirements from the （） that describe the project or problem. In either case, the requirements definition team formulates an overall concept for the system and then defines （） showing how the system will be operated, publishes the system and operations concept document, and conducts a system concept review(SCR). Following the SCR, the team derives （） requirements for the system from the high level requirements and the system and operations concept. Using structured or object-oriented analysis, the team specifies the software functions and algorithms needed to satisfy each detailed requirement.

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （） or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept （） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have （） network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message （） . As an example, gateways between Internet e-mail and X.400 e-mail must （） the e-mail message and change various header fields.

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable （） of the technical requirements for the software product. During the requirements definition phase, the requirements definition team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each （） that it must meet. The starting point is usually a set of high-level requirements from the （） that describe the project or problem. In either case, the requirements definition team formulates an overall concept for the system and then defines （） showing how the system will be operated, publishes the system and operations concept document, and conducts a system concept review(SCR). Following the SCR, the team derives （） requirements for the system from the high level requirements and the system and operations concept. Using structured or object-oriented analysis, the team specifies the software functions and algorithms needed to satisfy each detailed requirement.

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （） or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept （） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have （） network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message （） . As an example, gateways between Internet e-mail and X.400 e-mail must （） the e-mail message and change various header fields.

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable （） of the technical requirements for the software product. During the requirements definition phase, the requirements definition team uses an iterative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each （） that it must meet. The starting point is usually a set of high-level requirements from the （） that describe the project or problem. In either case, the requirements definition team formulates an overall concept for the system and then defines （） showing how the system will be operated, publishes the system and operations concept document, and conducts a system concept review(SCR). Following the SCR, the team derives （） requirements for the system from the high level requirements and the system and operations concept. Using structured or object-oriented analysis, the team specifies the software functions and algorithms needed to satisfy each detailed requirement.