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5?试求函数（1 -e^）u（t）的单边拉氏变换二、（15分，每问5分）已知某系统的系统函数为H （s）二-，试求（1）该s +7s + 10 系统函数的零极点；（2）判断该系统的稳定性；（3）该系统是否为无失真传输系统，请写出判断过程。、（10分）已知周期信号f（t）的波形如下图所示，求f（t）的傅里叶变换F（3）

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UML考试试题及答案3

2008-2009第2学期《与面向对象方法学》复习题二、单选题 1．（ A ）不是体系的组成部分。 A．应用领域B．规则C．基本构造块D．公共机制 2．在中，有四种事物，下面哪个不是（ B ）。 A．结构事物B．静态事物C．分组事物D．注释事物 3．以下（C ）不是中的优秀方法。 A．迭代的开发软件B．不断的验证软件质量 C．配置管理与变更管理D．支持正向与逆向工程4．下面（ D）属于中的动态视图。 A．类图B．用例图C．对象图D．状态图5．在中，（）把活动图中的活动划分为若干组，并将划分的组指定给对象，这些对象必须履行该组所包括的活动，它能够明确地表示哪些活动是由哪些对象完成的。A A．泳道B．同步条C．活动D．组合活动6．用例之间有几种不同的关系，下列哪个不是他们之间可能的关系（）。B A．B．C．D． 7．表示对一个在时间和空间上占据一定位置的有意义的事情的规格说明，下面哪个不是事件的类型（）。C

A．信号B．调用事件C．源事件D．时间事件8．通常对象有很多属性，但对于外部对象来说某些属性应该不能被直接访问，下面哪个不是中的类成员访问限定性（）。D A．B．C．D． 9．在中，类之间的关系有一种关系称为关联，其中多重性用来描述类之间的对应关系，下面哪个不是其中之一（）。A A．*....* B．0....* C．1....* D．0. (1) 10．关于包的描述，不正确的是（）。B A．和其他建模元素一样，每个包必须有一个区别于其他包的名字B．使一个包中的元素可以单向访问另一个包中的元素 C．包的可见性分为、、 D．包中可以包含其他元素，比如类、接口、组件、用例等等11．用来描述系统在事件做出响应时所采取的行动。用例之间是具有相关性的。在一个“订单输入子系统”中，创建新订单和更新订单都需要检查用户帐号是否正确。那么，用例“创建新订单”、“更新订单”与用例“检查用户帐号”之间是（）关系。C A．B．C．D． 12．中，用例图展示了外部与系统所提供的用例之间的连接，中的外部是指（）。D A．人员B．单位C．人员和单位D．人员或外部系统 13．在中，用例可以使用（）来描述。A

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大学英语三级试题.

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新视野大学英语3网上测试题及答案

Part 1 Word Dictation (每小题：1 分) Directions: Listen and write down the words you hear. You are going to listen to the recording twice. During the first time, write the word that you hear. Check your answers as you listen the second time. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13.

14. 15. Part 2 Understanding Short Conversations (每小题：1 分) Directions: In this section you'll hear some short conversations. Listen carefully and choose the best answer to the questions you hear. 1. A. Reading. B. Walking. C. Studying. D. Planting trees. 2. A. Animals are dying. B. Animals can care too. C. People depend on animals. D. People are failing. 3. A. Go on a hot date.

B. Return home. C. Fuel the car. D. Drive a lot. 4. A. Damage done by last night's winds. B. Cars overturned in the streets. C. Several houses destroyed. D. Trees pulled out of the ground. 5. A. The man will join the conservation group. B. The man will plant trees in the forest. C. The man will cut down trees in the forest. D. The man won't go with the woman today. Part 3 Understanding Long Conversations (每小题：1 分) Directions: In this section you'll hear a long conversation or conversations. Listen carefully and choose the best answer to the questions you hear.（DCBAC） Part 4 Understanding Passages (每小题：1 分)

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