以下关于动画的说法不正确的是(59)。
(61)从二叉树的任一节点出发到根的路径上,所经过的节点序列必按其关键字降序排列。
消息摘要算法MD5(Message Digest)是一种常用的(57)。MD5算法以一个任意长数据块作为输入,其输出为一个(58)比特的消息摘要。
与线性表的链接存储不相符的特性是(43)。
操作系统的作用是(26)。
在进行子系统结构设计时,需要确定划分后的子系统模块结构,并画出模块结构图。该过程不需要考虑__________。
在面向对象方法中,对象可看出是属性(数据)以及这些属性上的专用操作的封装体。封装是一种(30)技术,封装的目的是使对象的(31)分离。
在面向对象软件开发中,封装是一种______技术,其目的是使对象的使用者和生产者分离。
已知3个类A,B和C,其中类A由类B的一个实例和类C的1个或多个实例构成。能够正确表示类A,B和C之间关系的UML类图是(30)。
安全电子邮件使用(14)协议。
ATM协议的(24)层将其他网络接收到数据重组。
在(48)存储结构中,数据结构中元素的存储地址与其关键字之间存在某种映射关系。
数据的物理独立性是指当数据库的(54)。
利用(11)可以对软件的技术信息、经营信息提供保护。
计算机处理模拟视频信号过程中首先要进行(14)。
以下关于喷泉模型的叙述中,不正确的是______。
(36)不是单元测试主要检查的内容。
The Turing machine is an abstract(71)of computer execution and storage introduced in 1936 by Alan Turing to give a mathematically precise definition of(72). or 'mechanical procedure'. As such it is still widely used in theoretical computer science, especially in(73)theory and the theory of computation. The thesis that states that Turing machines indeed capture the informal notion of effective or mechanical method in logic and mathematics is known as Turing's thesis. Every Turing machine computes a certain(74)partial function over the strings over its alphabet. In that sense it behaves like a computer with a fixed program. However, as Alan luring already described, we can encode the action table of every Turing machine in a string. Thus we might try to construct a Turing machine that expects on its tape a string describing an action table followed by a string describing the input tape, and then computes the tape that the encoded Turing machine would have computed. As Turing showed, such a luring machine is indeed possible and since it is able to simulate any other Turing machine it is called a(75)Turing machine. A universal Turing machine is Turing complete. It can calculate any recursive function, decide any recursive language, and accept any recursively enumerable language. According to the Church-Turing thesis, the problems solvable by a universal Turing machine are exactly those problems solvable by an algorithm or an effective method of computation, for any reasonable definition of those terms.
已知3个类O,P和Q,类O中定义了一个私有方法F1和一个公有方法F2,类P中定义了一个公有方法F3,类P为类O的派生类,类Q为类P的派生类,它们的继承方式如下所示: class P:pubhc O{…} class Q:Pnvate P{…}在关于类P的描述中正确的是(42),在关于类Q的描述中正确的是(43)。
外部设备打印机适合于连接到(8)。
