Chapter 3 Number Systems and Boolean Algebra Key points: useful terms and definitions of Number system and Boolean Algbra Difficult points: Conversion of the Number Systems and Boolean Algbra

Chapter 2 Organization of Computers Key points: useful terms and organization of computers Difficult points: describing the organization of computers

Chapter 1 The History and Future of Computers Key points: useful terms and definitions of computers Difficult points: describing the features of computers of each generation

Chapter 14 Virtual Reality Key points: useful terms and definitions of Virtual Reality Difficult points: applications and features of VRML

Chapter 13 Computer Graphics Key points: concept of computer graphics Difficult points: Applications of computer graphics

Chapter 12 Multimedia Key points: useful terms and definitions of Multimedia Difficult points: Applications of multimedia

Chapter 11 Database Management Key points: useful terms and definitions of Database Management Difficult points: Classification of the logical structuring techniques of DBMS

Chapter 10 Computer and Network Security Key points: useful terms and definitions of computer security Difficult points: distinguish between four kinds of computer security breaches

一、书信(Letter) 书信(Letter)是用以交涉事务、增进了解、交流思想、 联络感情的工具。书信通常分为事务信件或公函( Business Letter or Official Correspondence)和私人信件(Private Letter) 两大类。英语书信从信封到正文,其写法格式与汉语的不尽 相同,有些方面则是完全不同的。下面将按写英语信的先后 次序,逐条举例作一解说

oissue: bring out (esp. sth. printed and /or official) for the notice of the public发布,发行 -----The school issued a statement about its plans to the press. ---th newsletter(简报) is issued three times a year. -----The Ministry of Finance has decided to issue new government bonds(债券)