26-1联轴器 26-2离合器 26-3弹簧

24-1概述 24-2滚子链及链轮 24-3链传动的设计计算 24-4链传动的布置、张紧与润滑

5-1摩擦的概念及类型 5-2运动副及机构中的摩擦 5-3机械效率与自锁

4-1刚体静力学 4-2平面机构的静力分析 4-3机械中空间力系分析

2-1点的运动 2-2刚体的基本运动 2-3点的合成运动 2-4刚体平面运动

一、了解强度理论; 二、熟悉二向应力状态分析; 三、掌握拉弯、弯扭组合变形

Background About the author: Floyd Dell (1887- 1969), U.S. versatile and prolific writer and an editor for several newspapers and magazines

Type of the text This is a short piece of narrative writing about an unforgettable Winter Millions have gone through winters over and over again but few have experienced a winter as is described in'the passage. a

Background knowledge The author William Plomer(1903-1973), South African writer born of English parents. His works include novels, short stories poems and biographies, but he is best known for his short Stories

1. Introduction 2. Pre-reading questions 3. Writing skills 4. Language points 5. Discussion 6. Homework