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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
文档格式:PPT 文档大小:98KB 文档页数:26
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
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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
文档格式:PPT 文档大小:177KB 文档页数:26
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
文档格式:PPT 文档大小:90KB 文档页数:16
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
文档格式:DOC 文档大小:757.5KB 文档页数:9
一、水平网站 水平网站可以将买方和卖方集中到一个市场上来进行信息交流、广告、拍卖竞标、交 易、库存管理等。水平网站一开始都以提供各大企业采购软件起家,如 , ariba Ariba.com的ariba.com 和 CommerceOne的 MarketSite net等,在积累了足够的客户群后才连带建立水平网站,因 此这类网站也可视为各大企业内部采购部门的延伸,其主要客户一般是大型企业
文档格式:PPT 文档大小:274.5KB 文档页数:23
Objectives When the learners finish learning this unit, they should be able to deal with problems and clients when placing orders (and trying to rectify them) complain and apologize know how to use present progressive tense to describe future arrangements
文档格式:PPT 文档大小:89.5KB 文档页数:12
A. What do you say? This is controlled review of the main functional language points from the previous four units. 1. Introduce the activity; ask learners how to make a prediction to elicit what they remember. 2. Alone or in pairs, learners match the remaining functions to the actual words. 3. Check their answers and then elicit alternatives for each function
文档格式:PPT 文档大小:127KB 文档页数:16
1 Introduce the activity. Q1: How to make a suggestion? 2. Alone or in pairs, learners match the remaining functions to the actual words. 3. Check their answers and then elicit alternatives for each function
文档格式:DOC 文档大小:1.29MB 文档页数:6
惠普公司的电子商务战略 一、惠普公司简介 惠普公司( ( hewlett-packard, www. hp.com)-packard,www.hp.com)是一家电子产品、测量系统、计算机系统 及通信系统的设计、制造和服务供应商,服务范围涉及工业、商业、工程、科学、医学及 教育等多个领域。惠普的经营宗旨是:促进科技知识进步,提高生产和工作效率。惠普的 产品包括计算机、计算机外围设备、电子测试测量仪及系统、网络产品、电子医疗设备、 化学分析仪器及系统、计算机以及元件等,共达29000种之多
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