3.1地理空间与空间实体 3.2概念数据模型 3.3逻辑数据模型 3.4空间关系

坐标系统和时间系统是描述卫星运动、处 理观测数据和表达观测站位置的数学与物 理基础

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

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

1.双通道数字存储示波器GDS-820/840 的使用 2.直流电源的使用介绍 3. 数字万用表的使用

1.1 单片机概述 1.2 微型计算机系统组成 1.3 微型计算机的运算基础知识

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

Chapter 1: Introduction Applications of Database Systems Database Systems versus File Systems View of Data Data Models Database Language Database Users and Administrator Transaction Management Database System Structure Application Architectures

第一节 概述 第二节 组成信号发生器的各种方案 第三节 合成信号发生器