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某销售公司数据库的零件关系（零件号，零件名称，供应商，供应商所在地，库存量）如下表所示，其中同一种零件可由不同的供应商供应，一个供应商可以供应多种零件。零件关系的主键为（1），该关系存在冗余以及插入异常和删除异常等问题。为了解决这一问题需要将零件关系分解为（2），分解后的关系模式可以达到（3）。

某销售公司数据库的零件关系（零件号，零件名称，供应商，供应商所在地，库存量）如下表所示，其中同一种零件可由不同的供应商供应，一个供应商可以供应多种零件。零件关系的主键为（1），该关系存在冗余以及插入异常和删除异常等问题。为了解决这一问题需要将零件关系分解为（2），分解后的关系模式可以达到（3）。

某销售公司数据库的零件关系（零件号，零件名称，供应商，供应商所在地，库存量）如下表所示，其中同一种零件可由不同的供应商供应，一个供应商可以供应多种零件。零件关系的主键为（1），该关系存在冗余以及插入异常和删除异常等问题。为了解决这一问题需要将零件关系分解为（2），分解后的关系模式可以达到（3）。

在磁盘调度管理中，应先进行移臂调度，再进行旋转调度。若磁盘移动臂位于22号柱面上，进程的请求序列如下表所示。若采用最短移臂调度算法，则系统的响应序列应为（1），其平均移臂距离为（2）。

在磁盘调度管理中，应先进行移臂调度，再进行旋转调度。若磁盘移动臂位于22号柱面上，进程的请求序列如下表所示。若采用最短移臂调度算法，则系统的响应序列应为（1），其平均移臂距离为（2）。

进程P1、P2、P3、P4、P5的前趋图如下。若用PV操作控制进程并发执行的过程，则需要相应于进程执行过程设置5个信号量S1、S2、S3、S4和S5，且信号量初值都等于零。下图中a处应填写（1）；b和c、d和e处应分别填写（2），f、g和h应分别填写（3）。

进程P1、P2、P3、P4、P5的前趋图如下。若用PV操作控制进程并发执行的过程，则需要相应于进程执行过程设置5个信号量S1、S2、S3、S4和S5，且信号量初值都等于零。下图中a处应填写（1）；b和c、d和e处应分别填写（2），f、g和h应分别填写（3）。

进程P1、P2、P3、P4、P5的前趋图如下。若用PV操作控制进程并发执行的过程，则需要相应于进程执行过程设置5个信号量S1、S2、S3、S4和S5，且信号量初值都等于零。下图中a处应填写（1）；b和c、d和e处应分别填写（2），f、g和h应分别填写（3）。

System analysis is traditionally done top-down using structured analysis based on (1). Object-oriented analysis focuses on creation ofmodels. The three types of the analysis model are (2). There are two substages of object-oriented analysis. (3) focuses on real-world things whose semantics the application captures. The object constructed in the requirement analysis shows the (4) of the real-world system and organizes it into workable pieces. (5) addresses the computer aspects of the application that are visible to users. The objects are those which can be expected to vary from time to time quite rapidly.

System analysis is traditionally done top-down using structured analysis based on (1). Object-oriented analysis focuses on creation ofmodels. The three types of the analysis model are (2). There are two substages of object-oriented analysis. (3) focuses on real-world things whose semantics the application captures. The object constructed in the requirement analysis shows the (4) of the real-world system and organizes it into workable pieces. (5) addresses the computer aspects of the application that are visible to users. The objects are those which can be expected to vary from time to time quite rapidly.

System analysis is traditionally done top-down using structured analysis based on (1). Object-oriented analysis focuses on creation ofmodels. The three types of the analysis model are (2). There are two substages of object-oriented analysis. (3) focuses on real-world things whose semantics the application captures. The object constructed in the requirement analysis shows the (4) of the real-world system and organizes it into workable pieces. (5) addresses the computer aspects of the application that are visible to users. The objects are those which can be expected to vary from time to time quite rapidly.

System analysis is traditionally done top-down using structured analysis based on (1). Object-oriented analysis focuses on creation ofmodels. The three types of the analysis model are (2). There are two substages of object-oriented analysis. (3) focuses on real-world things whose semantics the application captures. The object constructed in the requirement analysis shows the (4) of the real-world system and organizes it into workable pieces. (5) addresses the computer aspects of the application that are visible to users. The objects are those which can be expected to vary from time to time quite rapidly.

System analysis is traditionally done top-down using structured analysis based on (1). Object-oriented analysis focuses on creation ofmodels. The three types of the analysis model are (2). There are two substages of object-oriented analysis. (3) focuses on real-world things whose semantics the application captures. The object constructed in the requirement analysis shows the (4) of the real-world system and organizes it into workable pieces. (5) addresses the computer aspects of the application that are visible to users. The objects are those which can be expected to vary from time to time quite rapidly.