Pre-reading Questions 1. What does the \Green Revolution\ refer to? 2. Why did various writers predict that there would be widespread famine? 3. Name some countries with serious food shortages. 4. What is \miracle rice\?

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1. What causes today's reduced use of traditional fans? 2. Why does the author consider having no time to sit and fan oneself a big loss? 3. Where can one find elegant fans in New York City?

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Pre-reading Questions 1. What does the\Green revolution refer to? 2. Why did various writers predict that there would be widespread famine? 3. Name some countries with serious food shortages 4. What is \miracle rice?

Questions: on the text 1:Whydoestheauthor.comparea language with a living, organism? 2.Which: language family does English belong to? 3. What: is., it\:: causes: :. the languages. within a: single language family. to become different from one another? Does this, happen to one particular. language:: in.different periods of time. too

重点: 理论塔板、恒摩尔流、操作线方程、进料方程、回流比 难点: 操作线方程、进料方程、精馏设备 第一节 双组分溶液的气液平衡 第二节 平衡蒸馏和简单蒸馏 第三节 精馏原理和流程 第四节 两组分连续精馏的计算

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2.机电系统CAD算法基础 2.1.数值积分算法 2.1.1基本数值积分方法 连续系统的动态特性一般可由一个微分方程或一组一阶微分方程加以描述。因此对系统进行计算机仿真,就需要研究如何利用计算机对微分方程进行求解,目前采用的方法是应用数值积分法对微分方程求数值解,其中欧拉法、梯形法、龙格一库塔法等数值积分法是几种基本的方法

一、序列的Z变换 二、序列的傅里叶变换 三、序列的Z变换与连续时间信号的拉普拉斯变换、傅里叶变换的关系