Definition A tree is a collection of nodes. The collection can be empty: otherwise, a tree consists of (1) a distinguished node r, called the root; (2)and zero or more nonempty(sub)trees T1,., Tk, each of whose roots are connected by a directed edge from r Note:

一、教学方案 ①了解分散体系的定义和分类;理解溶胶的三大特性。 ②了解胶体分散体系的光学性质和动力学性质。 ③理解电泳、电渗现象以及胶粒带电的原因;掌握胶粒的双电教学目的和层结构和胶团结构式

string is composed ofn(20) characters in an orderly sequence recorded as s:“c1C2C3…Cn” S is string name c123n is value is a character n is string length Such as,S=“ TSinghua University

Sorting: There is a series of data in random order, we sort them depending a certain key word Datalist: an finity set of data waiting to be sorted Key: data object has many attribute areas, namely there are many data element, one of all these elements can be used to distinguish object, we use it as sorting key. we also call it sorting code

chapter 9 GRAPH ALGORITHMs $I Definitions e G(V,E) where G: =graph, V=V(G): :=finite nonempty set of vertices, andE=E(G): : = finite set of edges. d' Undirected graph:(V;,vi)=(j,vi): =the same edge 6 Directed graph(digraph): :=2* I tailhead

CHAPTER 4 Stacks and Queues SI The stack adt 1. ADT A stack is a Last-In-First-Out(LIFO)list, that is. an ordered list in which insertions and deletions are made at the top only Objects: A finite ordered list with zero or more elements

第八章图 1.图的基本概念 2.图的存储表示 3.图的遍历与连通性 4.最小生成树 5.最短路径 6.活动网络

第8章 异步电动机的基本工作原理和主要结构 第9章 异步电动机的运行分析 第10章 三相异步电动机及机械特性 第11章 三相异步电动机的起动、制动与调速

8.1异步电动机的主要用途和分类 一、异步电机主要用作电动机,去拖动各种生 产机械。 异步电动机的优点结构简单、容易制造、价格低廉、运行可靠、坚固耐用、运行效率较高和具有适用的工作特征。异步电动机的缺点功率因数较差。异步电动机运行时,必须从电网里吸收落后性的无功功率,它的功率因数总是小于1

感应电动机优点：结构简单、运行可靠、效率高、制造容易、成本低。 感应电动机缺点：不能平滑调速、调速范围窄、降低电网功率因数（对电网来讲 是感性负载）