re-class ActIvIty Discussion on the topic Pros and cons on t∨ Question 1 What effect does TV have on the Chinese family as a general rule? 2. What effect do you think TV has on the American family

Background Information Murphy's law is a popular adage in Western culture, which roughly states that things will go wrong in a technical system. It is often roughly stated as\ if anything can go wrong,it willi

Reading I The Weather Step-l Lead-in Questions 1, What is the impression of Englishmen on you? Deep, simple but narrow and conservative

Dictation of unit 2 1. Enough: 2. Flexible; 3. Suitable; 4. Polite, kind and pleasant Person who controls, directs or runs the affairs of a country organization or business

一、概念题 二、结构分析 三、轮系 四、齿轮 五、凸轮 六 、运动 七、连杆 八、调节

缺点： ① 制造和安装精度要求较高； ②不适宜用于两轴间距离较大的传动

一、棘轮机构的工作原理 二、棘轮机构的类型、特点和应用

1、定轴轮系：齿轮系传动过程中，其各齿轮的轴线 相对于机架的位置都是固定不变的

连杆机构 由低副（转动副、移动副、球面副、圆柱副、及螺旋副等）联结而成的机构。或称低副机构

一.研究机构的组成及机构运动简图的画法 二.了解机构具有确定运动的条件 三.研究机构的组成原理及结构分类