一、基本概念 1.函数极限的定义: (1)x→+∞时函数极限的定义:设f为定义在[+∞)上的函数,A为实数。若对任 给的>0,存在正数M(≥a),使得当x>M时有f(x)-Ak,则称函数f当x→+∞ 时以A为极限

a weakness of hashing Problem: For any hash function h, a set of keys exists that can cause the average access time of a hash table to skyrocket An adversary can pick all keys from tkeU: h(k)=i for some slot i IDEA Choose the hash function at random independently of the keys

一、单项选择题 1.b2.a3.c.d5.c6.a7.b.a.c10.d11.D 二、多项选择题 1. CE 2. AC 3. ABCDE 4. ABCD 5. BCD 6. ABCDE 7.ACD

18.1 Making predictions ( Language in use Read this article. Where do the sentences in the box belong? a soon, every business will have a website where it can advertise its products b business will certainly reduce their costs by using the Internet c The number of users is growing steadily at 10% a month

1 Crime has its own cycles, magazine some years ago. Police records that were studied for five years from over 2,400 cities and towns show a surprising link between changes in the seasons and crime patterns. July and August,as do rape and other violent attacks. Murder,moreover, is more than seasonal it is a weekend crime. It is also a nighttime crime: 62 percent of murders are

A reference frame consists(1)a coordinate system and(2)a set of synchronized clocks distributed throughout the coordinate grid and rest with respect to it

Balanced search trees Balanced search tree a search-tree data structure for which a height of o(g n)is guaranteed when implementing a dynamic set of n items

Graphs(review) Definition. a directed graph(digraph G=(, E)is an ordered pair consisting of a set y of vertices(singular: vertex) a sete c× of edges. In an undirected graphG=(V, E), the edge set e consists of unordered pairs of vertices In either case, we have El=O(v2).Moreover if G is connected, then E2v-l, which

一、单项选择题(每小题1分,共10分) 1、生态学按其性质一般分为:() A理论生态学B草原生态学C环境生态学D理论生态学与应用生态学 2、生态系统的结构包括:() A物种结构、时空结构B物种结构环境结构 C物种结构、时空结构、营养结构D营养结构、生物结构 3、种群波动的密度调节主要为:() A种间调节、食物调节B种内调节、食物调节 C.种间调节、种内调节D环境调节、食物调节

1.已知下列函数在指定区间上可积,用定义求下列积分: (1)|xtx(00)