第一节几何组成分析的目的 第二节平面体系的自由度概念 第三节几何不变体系的简单组成规则 第四节几何组成分析的步骤和举例 第五节静定结构和超静定结构

第一节杆件的内力及其求法 第二节梁的内力图及其绘制 第三节弯矩、剪力、荷载集度间的关系 第四节叠加法作剪力图和弯矩图 第五节其它杆件的内力计算方法

旅游经济学课程是阳江职业技术学院旅游管理专业开设的专业必修课。旅游经济学是 以经济学的一般理论为指导,研究旅游经济活动中各种经济现象、经济关系和经济规律的 科学。本课程旨在通过对旅游经济活动的运行及其运行过程中产生的经济现象、经济关系 的硏究,揭示支配旅游经济运行的规律,以有效地指导旅游实际工作,促进旅游经济的协 调、稳定、持续的发展,使旅游业获得更大的经济效益与社会效益

3.3.1凸轮机构的应用和分类 一、组成: Machinery 凸轮一个具有曲线轮廓或凹槽的构件,通过高副接触 凸轮机构一般由凸轮、从动件和机架三个构件组成。通常凸轮 为原动件,作连续等速转动从动件按预定规律作往复移动或摆 动

To present and practice English as it is used both in the explanation of modern machines and the processes they carry out. It also covers describing the operations needed to get machines to work and to show others how to undertake certain business operations Back

一、棘轮机构的工作原理 摆杆1左右摆动,当摆杆左摆时,棘爪4插入 棘轮3的齿内推动棘轮转过某一角度。 当摆杆右摆时,棘爪4滑过棘轮3,而棘轮静止 不动,往复循环。制动爪5防止棘轮反转 这种有齿的棘轮其进程的变化最少是1个齿距, 且工作时有响声

Warming up There are many occasions when people have to deal with money and talk about money. We know that a company always has its own Accounts department to deal with monetary problems. They pay their suppliers and receive money from buyers by invoice, letter of credit or other forms. Sometimes they need to chase money, and sometimes they owe money to other companies

3.3.1凸轮机构的应用和分类 一、应用:一当从动件的位移、速度、加速度必须严格按照 预定规律变化时,常用凸轮机构。 二、组成: 凸轮—一个具有曲线轮廓或凹槽的构件,通过高副接触 凸轮机构一般由凸轮、从动件和机架三个构件组成。通常凸轮 为原动件,作连续等速转动从动件按预定规律作往复移动或摆 动

Objectives This unit deals with basic telephoning skills and also receiving and noting down messages. Students are given a chance to discuss and develop their telephone techniques and practice making different kinds of business calls. The functions of requesting, offering help and asking permission are also introduced and practiced in this unit

objectives This unit deals with how to take notes in business contexts, how to summarize conversations and how to plan and write reports. It's a unit which can be used either as an introduction for students with little experience in report- and summary writing