试题1

假设现在要创建一个Web应用框架，基于此框架能够创建不同的具体Web应用，比如博客、新闻网站和网上商店等;并可以为每个Web应用创建不同的主题样式，如浅色或深色等。这一业务需求的类图设计适合采用()模式(如下图所示)。其中()是客户程序使用的主要接口，维护对主题类型的引用。此模式为()，体现的最主要的意图是()。

查看答案

试题2

若一个具有n个结点、k条边的非连通无向图是一个森林(n>k)，则该森林中必有（ ）棵树。
A、k 
B、n 
C、n-k 
D、n+k 

查看答案

试题3

下面关于在 I/O 设备与主机间交换数据的叙述，  （ ）  是错误的。
A、中断方式下，CPU 需要执行程序来实现数据传送任务
B、中断方式和 DMA 方式下，CPU 与 I/O 设备都可同步工作
C、中断方式和 DMA 方式中，快速 I/O 设备更适合采用中断方式传递数据
D、若同时接到 DMA 请求和中断请求，CPU 优先响应 DMA 请求

查看答案

试题4

以关键字比较为基础的排序算法在最坏情况下的计算时间下界为O(nlogn)。下面的排序算法中，最坏情况下计算时间可以达到O(nlogn)的是（1）；该算法采用的设计方法是（2）。
（1）A、归并排序 
B、插入排序 
C、选择排序 
D、冒泡排序
（2）A、分治法 
B、贪心法 
C、动态规划方法 
D、回溯法 

查看答案

试题5

查看答案

试题6

In a world where it seems we already have too much to do, and too many things to think about, it seems the last thing we need is something new that we have to learn.
But use cases do solve a problem with requirements: with （1 ） declarative requirements it's hard to describle steps and sequences of events.
Use cases, stated simply, allow description of sequences of events that, taken together, lead to a system doing something useful. As simple as this sounds, this is important. When confronted only with a pile of requiements, it's often（2 ）to make sense of what the authors of the  requirements really wanted the system to do. In the preceding example, use cases reduce the ambiguity of the requirements by specifying exactly when and under what conditions certain behavior occurs; as such, the sequence of the behaviors can be regarded as a requirement. Use cases are particularly well suited to capture approaches. Although this may sound simple, the fact is that (3 ) requirement capture approaches, with their emphasis on declarative requirements and "shall" statements, completely fail to capture fail to capture the (4 ) of the system's behavior. Use cases are a simple yet powerful way to express the behavior of the system in way that all stakeholders can easily understand.
But, like anything, use cases come with their own problems, and as useful as they are, they can be (5 ). The result is something that is as bad, if not worse, that the original problem. Therein it's important to utilize use cases effectively without creating a greater problem than the one you started with.
（1）A.plenty
B.loose
C.extra
D.strict
（2）A.impossible
B.possible
C.sensible
D.practical
（3）A.modern
B.conventional
C.different
D.formal
（4）A.statics
B.nature
C.dynamics
D.originals
（5）A.misapplied
B.applied
C.used
D.powerful

查看答案

试题7

彩色打印机中所采用的颜色空间是（ ）。
A、RGB彩色空间 
B、CMY彩色空间  
C、YUV彩色空间 
D、HSL彩色空问 

查看答案

试题8

若将某有序树 T 转换为二叉树 T1，则 T 中结点的后（根）序序列就是 T1 中结点的  （ ）  遍历序列。例如，下图(a)所示的有序树转化为二叉树后如图(b)所示。

A、先序
B、中序
C、后序
D、层序

查看答案

试题9

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  （1）  ，可确认该数字证书的有效性，从而 （2） 。
（1）A、CA的签名
B、网站的签名
C、会话密钥
D、DES密码
（2）A、向网站确认自己的身份
B、获取访问网站的权限
C、和网站进行双向认证
D、验证该网站的真伪

查看答案

试题10

查看答案