第四章的思想:一是将信号分解为e虚指数信号的叠加傅 氏级数和傅氏变换。二是响应的合成。即把作为测试信号,系统 频率特性H(jo)响应为eH(jo)叠加。对分析谐波成分、频率响应、 波形失真、取样、滤波十分有效

一、掌握维生素A、B1、C、D、E的结构、性质和鉴别、检查、含量测定方法。 二、熟悉本类药物其它的含量测定方法以及杂质检查方法。 三、了解维生素A三点校正法的推导过程

一、对数频率特性 1.增益 设H(jo)=|H(j)e) 令G()=lnH(jo)(对数)增益,单位Np(奈培)或G()=201ogH(jo)常用对数增益,dB分贝东南大学移动通信国家重点实验室

(1)1/0方程:D(p)r(t)=N(p)e(t) (2)系统函数H(s)=(s) (3)框图/流图 (4)状态方程

可逆矩阵 一、逆矩阵的概念与性质 1.定义5.1设A是一个n阶方阵,若存在n阶方阵B 使 AB=BA=E 则称B为A的逆矩阵,并称A可逆

asynchronous[a'si6 k ranas]a.异步的 serial[' sirian]a.串行的,串联的 transmission[ t raen z'mi∫an]a.传输,发送 interface[ i n taf e i s]r.接口

Chapter 1 Introduction of Electronic commerce 1. 1 Development of Electronic Commerce(e-commerce 1.1.1 Histor Throughout history, attempts to promote new means of communication were simply means with which to increase opportunities for ease, efficiency and security. The foundations on which electronic commerce is based started 125 years ago with the use of telegraph

Chapter 4 Website design 4.1 General Design of e-Business website 4.1.1 Defining the task Once you have decided to hire [COMPANy], the first step is to define the project very carefully and very thoroughly. It is critical to put down on paper what is and isn't included for the agree-to price. We call this the\Statement of Work\and include it as part of our proposal. For us to prepare this document, we're going to have a lot of questions to ask. If you haven,'t done so

一、电源 将其他形式能量转变成电能的装置。 从电流线闭合看:jds=0 从能量守恒及转换看:E=},欲形成稳恒电流,电路中电源不可少且电路闭 合

一、孤立导体的电容 1、定义 静电平衡时,孤立导体表面电荷分布由其几何形状唯一确定,带一定电量q的孤 立导体其外部空间的电场E、电势U导亦完全确定。据电势叠加原理,当其电量增加若 干倍时,则U也将增加若干倍,即 q=CU,或C=9 此比例系数C即孤立导体的电容量