一、平面运动副: 1.概念:在同一平面中两构件直接接触而构成的可动联接。 2.分类(按所占空间位置):

1.常见传动系统的传动比:圆柱齿轮=5,锥齿轮=3,链=8,带=6,1平带=3 蜗杆:5≤i≤100,15≤i≤50 2.手表30°=720{17 360°×60 大d=17×720×3mm=36.72m一对齿轮

齿轮机构是在各种机构(连杆、凸轮等)中应用最为广泛的一种传动机构齿 轮传动是机械传动中应用最广泛的一类传动,形式很多。它的先进与否可以衡量一 个国家的工业水

一、名词解释 1、资产 2、负债 3、所有者权益 4、可比性原则

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

Chapter 6: Integrity and Security (完整性与安全性) Domain Constraints(域约束) Referential Integrity(参照完整性) Assertions(断言) Triggers(触发器) Security(安全性) Authorization(授权) Authorization in SQL(SQL中的授权) Database System Concepts

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 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

8.1差错控制编码的基本概念 8.1.1差错控制方式 图8-1差错控制系统

5.1脉冲编码调制(PCM) 5.1.1脉冲编码调制的基本原理