8.1串口通讯基础 8.2串口控制 8.3串行接口的工作方式 8.4串口的应用 8.5多机通讯 8.6MCS51与PC机通讯电路

7.1随机读写存储器RAM的扩展 7.2只读存储器ROM的扩展 7.3地址译码的方法 7.4并行接口芯片8155

10.1常用接口器件 10.2常用接口设计

Chapter 7: Relational Database Design First Normal Form Pitfalls in Relational Database Design Functional Dependencies Decomposition Boyce-Codd Normal Form Third Normal Form Multivalued Dependencies and Fourth Normal Form

Chapter 4: SQL Background Basic Structure Set Operations Aggregate Functions Null Values Nested Subqueries Derived Relations Views Modification of the Database Joined Relations

6-1概述 6.2定时器/计数器T0、T1

9.1水表、电能表数据采集系统 9.2无总线单片微机应用系统

Chapter 3: Relational Model Structure of Relational Databases Relational Algebra Extended Relational-Algebra-Operations Modification of the Database Views Tuple Relational Calculus Domain Relational Calculus Database System Concepts

Chapter 2: Entity-Relationship Model Basic Concepts Constraints Keys Design Issues E-R Diagram Weak Entity Sets Extended E-R Features Design of an E-R Database Schema Reduction of an E-R Schema to Tables

1.1 计算机病毒的概念 1.2 计算机病毒原理 1.3 计算机病毒编制的关键技术 1.4 蠕虫 1.5 木马 1.6 病毒对抗技术