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MP3是目前最流行的数字音乐压缩编码格式之一，其命名中MP是指 (12) ，3是指 (13) 。

MP3是目前最流行的数字音乐压缩编码格式之一，其命名中MP是指 (12) ，3是指 (13) 。

若一个项目由9个主要任务构成，其计划图(如下图所示)展示了任务之间的前后关系以及每个任务所需天数，该项目的关键路径是 (16) ，完成项目所需的最短时间是 (17) 天。

若一个项目由9个主要任务构成，其计划图(如下图所示)展示了任务之间的前后关系以及每个任务所需天数，该项目的关键路径是 (16) ，完成项目所需的最短时间是 (17) 天。

假设系统中有4类互斥资源R1、R2、R3和R4，可用资源数分别为9、6、3和3。在T0时刻系统中有P1、P2、P3和P4这4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。在T0时刻系统剩余的可用资源数分别为 (23) 。如果P1、 P2、P3和P4进程按 (24) 序列执行，那么系统状态是安全的。

假设系统中有4类互斥资源R1、R2、R3和R4，可用资源数分别为9、6、3和3。在T0时刻系统中有P1、P2、P3和P4这4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。在T0时刻系统剩余的可用资源数分别为 (23) 。如果P1、 P2、P3和P4进程按 (24) 序列执行，那么系统状态是安全的。

设每个页面可存放128个整数变量，变量i，j放在程序页中，矩阵A按行序存放。初始时，程序及变量i、j已在内存，其余两页为空。在上述程序片段执行过程中，共产生 (27) 次缺页中断。最后留在内存中的是矩阵A的最后 (28) 。

设每个页面可存放128个整数变量，变量i，j放在程序页中，矩阵A按行序存放。初始时，程序及变量i、j已在内存，其余两页为空。在上述程序片段执行过程中，共产生 (27) 次缺页中断。最后留在内存中的是矩阵A的最后 (28) 。

面向对象分析与设计中的 (37) 是指一个模块在扩展性方面应该是开放的，而在更改性方面应该是封闭的；而 (38) 是指子类应当可以替换父类并出现在父类能够出现的任何地方。

面向对象分析与设计中的 (37) 是指一个模块在扩展性方面应该是开放的，而在更改性方面应该是封闭的；而 (38) 是指子类应当可以替换父类并出现在父类能够出现的任何地方。

(40) 限制了创建类的实例数量，而 (41) 将一个类的接口转换成客户希望的另外一个接口，使得原本由于接口不兼容而不能一起工作的那些类可以一起工作。

(40) 限制了创建类的实例数量，而 (41) 将一个类的接口转换成客户希望的另外一个接口，使得原本由于接口不兼容而不能一起工作的那些类可以一起工作。

(43) 设计模式允许一个对象在其内部状态改变时改变它的行为。下图为这种设计模式的类图，已知类State为抽象类，则类 (44) 的实例代表了Context对象的状态。

(43) 设计模式允许一个对象在其内部状态改变时改变它的行为。下图为这种设计模式的类图，已知类State为抽象类，则类 (44) 的实例代表了Context对象的状态。

在UML的各种视图中， (45) 显示外部参与者观察到的系统功能； (46) 从系统的静态结构和动态行为角度显示系统内部如何实现系统的功能； (47) 显示的是源代码以及实际执行代码的组织结构。

在UML的各种视图中， (45) 显示外部参与者观察到的系统功能； (46) 从系统的静态结构和动态行为角度显示系统内部如何实现系统的功能； (47) 显示的是源代码以及实际执行代码的组织结构。

某学校学生、教师和课程实体对应的关系模式如下：
学生(学号，姓名，性别，年龄，家庭住址，电话)
课程(课程号，课程名)
教师(职工号，姓名，年龄，家庭住址，电话)
如果一个学生可以选修多门课程，一门课程可以有多个学生选修；一个教师只能讲授一门课程，但一门课程可以有多个教师讲授。，由于学生和课程之间是一个 (51) 的联系，所以 (52) 。又由于教师和课程之间是一个 (53) 的联系，所以 (54) 。

某学校学生、教师和课程实体对应的关系模式如下：
学生(学号，姓名，性别，年龄，家庭住址，电话)
课程(课程号，课程名)
教师(职工号，姓名，年龄，家庭住址，电话)
如果一个学生可以选修多门课程，一门课程可以有多个学生选修；一个教师只能讲授一门课程，但一门课程可以有多个教师讲授。，由于学生和课程之间是一个 (51) 的联系，所以 (52) 。又由于教师和课程之间是一个 (53) 的联系，所以 (54) 。

关系R、S如下图所示，关系代数表达式π1,5,6(σ2＝5 (R×S))＝ (55) ，该表达式与 (56) 等价。

（55）处填（）。

一个具有m个结点的二叉树，其二叉链表结点(左、右孩子指针分别用left和right表示)中的空指针总数必定为 (57) 个。为形成中序(先序、后序)线索二叉树，现对该二叉链表所有结点进行如下操作：若结点p的左孩子指针为空，则将该左指针改为指向p在中序(先序、后序)遍历序列的前驱结点；若p的右孩子指针为空，则将该右指针改为指向p在中序(先序、后序)遍历序列的后继结点。假设指针s指向中序(先序、后序)线索二叉树中的某结点，则 (58) 。

在UML的各种视图中， (45) 显示外部参与者观察到的系统功能； (46) 从系统的静态结构和动态行为角度显示系统内部如何实现系统的功能； (47) 显示的是源代码以及实际执行代码的组织结构。

某学校学生、教师和课程实体对应的关系模式如下：
学生(学号，姓名，性别，年龄，家庭住址，电话)
课程(课程号，课程名)
教师(职工号，姓名，年龄，家庭住址，电话)
如果一个学生可以选修多门课程，一门课程可以有多个学生选修；一个教师只能讲授一门课程，但一门课程可以有多个教师讲授。，由于学生和课程之间是一个 (51) 的联系，所以 (52) 。又由于教师和课程之间是一个 (53) 的联系，所以 (54) 。

某学校学生、教师和课程实体对应的关系模式如下：
学生(学号，姓名，性别，年龄，家庭住址，电话)
课程(课程号，课程名)
教师(职工号，姓名，年龄，家庭住址，电话)
如果一个学生可以选修多门课程，一门课程可以有多个学生选修；一个教师只能讲授一门课程，但一门课程可以有多个教师讲授。，由于学生和课程之间是一个 (51) 的联系，所以 (52) 。又由于教师和课程之间是一个 (53) 的联系，所以 (54) 。

关系R、S如下图所示，关系代数表达式π1,5,6(σ2＝5 (R×S))＝ (55) ，该表达式与 (56) 等价。

一个具有m个结点的二叉树，其二叉链表结点(左、右孩子指针分别用left和right表示)中的空指针总数必定为 (57) 个。为形成中序(先序、后序)线索二叉树，现对该二叉链表所有结点进行如下操作：若结点p的左孩子指针为空，则将该左指针改为指向p在中序(先序、后序)遍历序列的前驱结点；若p的右孩子指针为空，则将该右指针改为指向p在中序(先序、后序)遍历序列的后继结点。假设指针s指向中序(先序、后序)线索二叉树中的某结点，则 (58) 。

It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. (71) is a means to capture ideas, relationships, decisions, and requirements in a well-defined notation that can be applied to many different domains. Modeling not only means different things to different people, but also it can use different pieces of UML depending on what you are trying to convey. In general, a UML model is made up of one or more (72) . A. diagram graphically represents things, and the relationships between these things. These (73) can be representations of real-world objects, pure software constructs, or a description of the behavior of some other objects. It is common for an individual thing to show up on multiple diagrams; each diagram represents a particular interest, or view, of the thing being modeleD. UML 2.0 divides diagrams into two categories: structural diagrams and behavioral diagrams. (74) are used to capture the physical organization of the things in your system, i.e., how one object relates to another. (75) focus on the behavior of elements in a system. For example, you can use behavioral diagrams to capture requirements, operations, and internal state changes for elements.

It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. (71) is a means to capture ideas, relationships, decisions, and requirements in a well-defined notation that can be applied to many different domains. Modeling not only means different things to different people, but also it can use different pieces of UML depending on what you are trying to convey. In general, a UML model is made up of one or more (72) . A. diagram graphically represents things, and the relationships between these things. These (73) can be representations of real-world objects, pure software constructs, or a description of the behavior of some other objects. It is common for an individual thing to show up on multiple diagrams; each diagram represents a particular interest, or view, of the thing being modeleD. UML 2.0 divides diagrams into two categories: structural diagrams and behavioral diagrams. (74) are used to capture the physical organization of the things in your system, i.e., how one object relates to another. (75) focus on the behavior of elements in a system. For example, you can use behavioral diagrams to capture requirements, operations, and internal state changes for elements.

It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. (71) is a means to capture ideas, relationships, decisions, and requirements in a well-defined notation that can be applied to many different domains. Modeling not only means different things to different people, but also it can use different pieces of UML depending on what you are trying to convey. In general, a UML model is made up of one or more (72) . A. diagram graphically represents things, and the relationships between these things. These (73) can be representations of real-world objects, pure software constructs, or a description of the behavior of some other objects. It is common for an individual thing to show up on multiple diagrams; each diagram represents a particular interest, or view, of the thing being modeleD. UML 2.0 divides diagrams into two categories: structural diagrams and behavioral diagrams. (74) are used to capture the physical organization of the things in your system, i.e., how one object relates to another. (75) focus on the behavior of elements in a system. For example, you can use behavioral diagrams to capture requirements, operations, and internal state changes for elements.

It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. (71) is a means to capture ideas, relationships, decisions, and requirements in a well-defined notation that can be applied to many different domains. Modeling not only means different things to different people, but also it can use different pieces of UML depending on what you are trying to convey. In general, a UML model is made up of one or more (72) . A. diagram graphically represents things, and the relationships between these things. These (73) can be representations of real-world objects, pure software constructs, or a description of the behavior of some other objects. It is common for an individual thing to show up on multiple diagrams; each diagram represents a particular interest, or view, of the thing being modeleD. UML 2.0 divides diagrams into two categories: structural diagrams and behavioral diagrams. (74) are used to capture the physical organization of the things in your system, i.e., how one object relates to another. (75) focus on the behavior of elements in a system. For example, you can use behavioral diagrams to capture requirements, operations, and internal state changes for elements.

It should go without saying that the focus of UML is modeling. However, what that means, exactly, can be an open-ended question. (71) is a means to capture ideas, relationships, decisions, and requirements in a well-defined notation that can be applied to many different domains. Modeling not only means different things to different people, but also it can use different pieces of UML depending on what you are trying to convey. In general, a UML model is made up of one or more (72) . A. diagram graphically represents things, and the relationships between these things. These (73) can be representations of real-world objects, pure software constructs, or a description of the behavior of some other objects. It is common for an individual thing to show up on multiple diagrams; each diagram represents a particular interest, or view, of the thing being modeleD. UML 2.0 divides diagrams into two categories: structural diagrams and behavioral diagrams. (74) are used to capture the physical organization of the things in your system, i.e., how one object relates to another. (75) focus on the behavior of elements in a system. For example, you can use behavioral diagrams to capture requirements, operations, and internal state changes for elements.