Text A: fantasy, suspicion, injection, deputy, considerate, restore, estate, fantastic, multiple, furnish, deceive, commission, substantial, arrest, motive, justify exceeding, swear, disguise, switch e Text B: romantics, mysterious, e it, sigh, simplify, standpoint, heave, shiver, 2. Key phrases and expressions Text A: raise a glass to, turn out, buy up, live out, add on, fix up, sell sth at a loss Text B: read about, for one thing, in the night, make an appointment, switch on, raise the devil answer the door. stare after 3. Key structures

一、（1）× （2）√√ （3）√× （4）× （5）√ 二、（1）A A （2）D A （3）B A （4）D B （5）C B 三、（1）B D （2）C （3）A

设矩阵A∈Rn,如果存在数入∈C及非零向量x∈C满足方程 Ax∈x,则称λ为矩阵A的一个特征值,称为矩阵A的相应于特 征值λ的特征向量。为简单起见,下称,x为矩阵A的一特征对。 特征值的计算,直接从特征方程()=det-A)=0出发会遇到很 大困难,当n稍大一些,行列式展开本身就很不容易,随后是高次代数 方程求解。因此,矩阵特征值的求解,主要是数值解法

材料工程基础试卷B答案 一、选择题(共15题,每题2分,共30分) .A 2. 3.A 4.C 5.B 6B7B8C9.A10.C 11C12.A13.B14.A15.B

定理3.4.1若AcR\,BcR”,且均可测,则A×B={(a,b)|a∈A,b∈B} R\×R为可测集,且m(A×B)= mAXmB 证明1)若区间IcR\,I2cR,则显然I×I2为R\×R中的区间,从 而可测。且|I×12|=|I|×|I2|

7.1 I/O接口扩展概述 7.2 MCS-51与可编程并行I/O芯片8255A的接口 7.3 显示器键盘接口 7.2.2 工作方式选择控制字及C口置位/复位控制字 7.2.3 8255A的三种工作方式 7.2.4 MCS-51单片机和8255A的接口 7.3 用74LSTTL电路扩展并行I/O口 11.1 MCS-51与DAC的接口 11.2 MCS-51与ADC的接口 11.3.MCS-51与ADC0809的接口

6-2相量法的基本知识 一、复数 (1)代数形式A=a+jba—实部b—虚部 a=R[A]=R[a+jb]R取实部 b=m=mla+jm取虚部 一个复数可以表示在复平面上

把一个mxn矩阵A,在行的方向上分成s块,在 列的方向分成t块,称为A的sxt分块矩阵,记作 A=[Asx其中A(k=12s1,2t称为A的 子块,它们是各种类型的小矩阵 常用的分块矩阵,除了上面的4块矩阵,还有以 下几种形式:

1 Graphs and Trees The following two definitions of a tree are equivalent Definition 1: A tree is an acyclic graph of n vertices that has n-1 edges Definition 2: A tree is a connected graph such that Vu, v E V, there is a unique path connecting u to u. In general, when we want to show the equivalence of two definitions, we must show

Functional groups The structural features that make it possible to classify compounds by reactivity are called functional groups. A functional group is a part of a larger molecule and is composed of an atom or a group of atoms that have a characteristic chemical behavior. The Chemistry of every organic molecules