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

步进电动机是一种将电脉冲信号转换成机械位移的机电执行元件

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

Chapter 15: Transactions Transaction Concept Transaction State Implementation of Atomicity and Durability Concurrent Executions Serializability Recoverability Implementation of Isolation Transaction Definition in SQL

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

§2.1 进样系统§2.2 电离方式和离子源 §2.3 质量分析器 §2.4 几种常见商用质谱仪

● 数字信号处理 ● DSP芯片的特点 ● DSP系统 ● DSP系统的设计过程

§1.1 质谱的基本概念 §1.2 质谱分类 §1.3 质谱学的发展历史 §1.3 常用概念 §1.4 质谱学的专著、期刊和国内国际会议

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

10.1AT89C2051内部结构与功能 10.2振荡器和专用寄存器功能 10.3指令约束条件和CPU的工作方式