以色列 Cimatron软件有限公司作为世界上著名的 CAD/CAM软件供应商一直致力于为制造行业提供 先进的 CAD/CAM系统,不仅为用户提供功能强大的通用 CAD/CAM系统,而且针对模具制造行业提供了 全面的解决方案。 Cimatron公司成立于1982年,其股票已经在美国的 NASDAQ上市。在世界范围内,Ci matron已拥有π000多个用户,系统销量达12000套。用户广泛遍布于汽车、航空、计算机、玩具、消 费类商品、医疗、军事、光学仪器、远程通讯、教育机构和科研院所等

超声波加工是利用振动频率超过16 000 Hz的工具头，通过悬浮液磨料对工件进行成型加工的一种方法

What to publish? Full-length articles are about 5, 000 words: a series of experiments making a coherent story Short notes are about 200 words General rule: it is better to publish one solid paper than to split it into two or three short notes Articles in books and reports are less prestigious: publish your primary data in international journals

Nobel lecture december 12, 1933 On passing through an optical instrument, such as a telescope or a camera lens, a ray of light is subjec reflecting surface. The path of the rays can be constructed if we know the two simple laws which govern the changes in direction: the law of refrac- tion which was discovered by Snellius a few hundred years ago, and the law of reflection with which Archimedes was familiar more than 2,000 years ago

大约在2500035,000年前,人类 知道了不依靠天然火而自行取火

1.通过综合分析地质图,使学生比较全面地掌握 构造地质学的基本理论知识,提高学生分析地 质图的能力 2.学习编绘、编写某些图件和读图报告的基本方 法和技能,为野外地质实习和今后实际地质工 作打下较好基础

Background An icbm with a range of 6500 miles has a stagnation temperature of 12,000%F, 2000 f hotter than the surface of the sun Calculations showed that the optimum design for structural strength, resistance to heating, and free flight stability was a long, needle nosed reentry body But it would vaporize during reentry

hool of Business, Sun Y at-sen University L 2 Economic Transactions and Accounting equation Exercises 1. Lion Company had a net cash inflow of $80,000 from operating activi

一、CA概况 (一)CA的出版者和创刊年 CA创刊于1907年,由CAS即 Chemical Abstracts Service,美国化学文摘服务社创办。 (二)CA的收录范围 CA被称为“世界化学化工文献的钥匙”,收 录世界各国化学化工方面的出版物约16,000余 种,包括期刊论文、会议录、资料汇编、报告 、新书、专利等

A naval architect asked to design a ship may receive his instructions in a form ranging from such simple requ ents as \an oil tanker to carry 100 000 tons deadweight at 15 knot nots\to a fully detailed specification of precisely planned requirements. He is usually required to prepare design for a vessel that must carry certain