本课程是电子信息工程、通信工程、计算机及物理等专业本科生的专业基础课，本课程的主要任务是学习常用的半导体器件的结构、导电机制、伏安特性及其主要参数，在此基础上进一步学习各种电子电路的基本组成、工作原理和分析方法，使学生初步掌握电子电路的分析计算和设计方法，以便为学习数字电子技术、高频电路、通信电子线路和信号与系统等后续课程提供必要的基础理论知识。在学习本课程前学生需要具备工程数学、物理和电路分析等方面的知识

At least 90 percent of UFO sightings can be identified as conventional objects, although time-consuming investigations are often necessary for such identification. The objects most often mistaken for UFOs are bright planets and stars aircraft, birds, balloons kites aerial flares, peculiar clouds, meteors and satellites. The remaining sightings most likely can be attributed to other mistaken sightings or to inaccurate reporting hoaxes or delusions although to disprove all claims made about UFOs is impossible

violent crimes robbery, aggravated assault hijack forcible rape, murder, bombing kidnapping, shooting a Property crimes arson, burglary, larceny-theft, fraud, motor/ vehicle theft Neighborhood Watch in Britain, there is an arrangement by which people who live in a particular

And so even though we face the difficulties of today and tomorrow, I still hay a dream. It is a dream deeply rooted in American dream. I have dream that one day this nation will rise up and live out the true meaning of

1. grasp the main idea( tolerance for solitude and energy made it possible for the writer s family to enjoy their pleasant but sometimes harsh country life.) 2. appreciate the various techniques employed by the writer comparison and contrast, topic sentences followed by detail sentences

MATLAB意为“矩阵实验室”，源自 Matrix Laboratory ，它是一种科学计算软件。 Matlab语言是由美国的Clever Moler博士于1980年。开发的设计者的初衷是为解决“线性代数”课程的矩阵运算问题。 目前MATLAB已经成为国际上最流行的软件之一，除了可提供传统的交互式的编程方法之外，还能提供丰富可靠的矩阵运算、图形绘制、数据处理、图像 处理和Windows编程工具等。因而出现了各种以MATLAB为基础的工具箱，应用于自动控制、图像信号处理、生物医学工程、语音处理、信号分析、时序 分析与建模、优化设计等广泛的领域，表现出了一般高级语言难以比拟的优势。 美国Mathwork软件公司推出的Matlab软件就是为了给人们提供一个方便的数值计算平台而设计的

grasp the main idea(we should adopt a sensible environmentalism) and the structure of the text(each part containing a contrast) 2)appreciate the various argumentative skills employed in the text 3master the key language points and grammatical structures in the text

到目前为止，我们讨论了连续时间周期信号的频谱（CTFS）、连续时间非周期信号的频谱（CTFT）及非周期序列的频谱(DTFT)，本章主要讨论周期序列的傅里叶级数（DFS)及其性质、有限长序列的傅里叶变换(DFT)的性质、有限长序列的傅里叶变换与周期序列的傅里叶级数的关系。有限长序列的离散傅里叶变换不仅在理论上十分重要，而且还存在快速算法，因此，离散傅里叶变换在数字信号处理中起着核心作用。 6.1 有限长序列与周期序列的关系 6.2 导出周期序列傅里叶级数的各种途径 6.3 常用周期序列的傅里叶级数 6.4 离散傅里叶变换 6.5 DFS与DFT的性质 6.6 离散傅里叶级数分析法 6.7 有限长序列的ZT、DTFT及DFT的相互表示 6.8 利用DFT逼近CTFT

Contents Teaching Objectives Background Information Text Organization Language Points

Pm Going to Buy the Brooklyn Bridge Teaching Objectives grasp the main idea(the belief in superwomen encourages average women to achieve their goals)and the structure of the text 2) appreciate how the author achieves coherence for her essay 3master the key language points and grammatical structures in the text