基本概念 定义与例子 关于未知函数(x1,∞2,……,n)的偏微分方程是形如 F(,, Du, ur,r1,r1T2' (11.1) 的关系式,其中,x=(x1,x2,…,mn),Du=(tx1,ux2 F是关于自变量x和未知函数a及a的有限多个偏微商的已 知函数.F可以不显含未知函数及其自变量x,但必须含有 未知函数的偏微商.涉及几个未知函数及其偏微商的多个偏微分 方程构成一个偏微分方程组.除非另有说明,我们限制自变量 x=(x1,x2,…,xn)取实数值,并设函数a及其出现在方程中 的各阶偏微商连续

一、离散时间信号——序列 二、离散时间系统 三、线性常系数差分方程 四、连续时间信号的取样 五、Matlab实现

本章执行主菜单4形成PK文件 ,生成平面图上任意一榀框架的数 据文件,提供给(钢筋混凝土排架及 连续梁结构计算与施工图绘制软件 )PK,熟练掌握利用计算机计算框 架配筋结果,画出框架结构施工图

一、裤子简介 二、裤子结构制图 三、裤子推板

Questions on the text Did people have to attend on machines hundreds of years ago? What happened to industry about a hundred years ago? What is the operation of automatic machines based on?

1. In what physical condition is the writer's grandmother? with her? 3. Is she happy Why or why not? 4 Are retirement homes all bad? 5. What did the writer's mother decide to do when Grandma could not live on her own? 6. How are elderly people treated in many cultures? 7. Why are old people unhappy in a nursing home? 8. What is the writer's opinion concerning the treatment of aging people? 9. What is your own opinion concerning the old people n general?

Teaching Outline Background information Pre-reading questions Passage analysis Style and structure Spellings Word derivations Language points Useful expressions Weekly quiz

Pre-reading Questions 1. Why were the girls warned that they should not regard school as \Brighton beach\ and what was implied in the warning? 2.What is the purpose of education according to the author?

Alexander graham bell an inspired black-haired scotsman of twenty eight, on the eve of marriage, vibrant and alive to new ideas Alexander Graham bell. The Man who invented the Telephone A| xander graham be‖l 1847to1922

Teaching Outline Pre -reading- Questions Famous Quotations of Study Passage Analysis A spelling word derivation language points useful expression