1矩阵的概念 一、实际例子 例1设某物质有m个产地,n个 销地,如果以a;表示由第i个产地销往 第j个销地的数量,则这类物质的调运 方案,可用一个数表表示如下:

1第一型线面积分 例1求(xy+yz+zx)ds,其中L是球面x2+y2+z2=a2与平面x+y+z=0的交 线 解法1(xy+yz+zx)ds=2(xy+yz+zx)ds =[(x+y+z)2-(x2+y2+z2)ds

一、概念(20分) 烃化、酯化反应、氢解、重氮化反应、F.N.A. 二、填空(20分) 1、精细有机合成工艺学主要包括以下内容:对具体 产品选择和确定技术上和经济上最合理的和 对单元反应确定 和 以得到高质量、高收率的产品

The Two-Factor Hul-white Model (equation 24.1, page 571) dx=0(0)+u-ax dt +o,dz1 du= -but +o,dz, where=f(r and the correlation between dz, and dz, is p The short rate reverts to a level dependent on u, and u itself is mean reverting

9-1如图9-1所示,一条无穷长载流20A的直导线在P点被折成120°的钝角,设d=2cm,求P点的磁感应强度。 解:P点在OA延长线上,所以OA上的电流在P的磁感应强度为零

1、在一级不可逆气固相催化反应中,如果内、外扩散及本征动力学对宏观反应速率有影响,画出反应物A在气膜内与催化剂颗粒内的浓度分布示意图

2-1导热基本定律 1、温度场 傅立叶定律为:Φ=-A,为求通过物体的热流量必须 知道物体内部的温度分布。一般地讲,物体的温度分布是坐标 和时间的函数,即

Chilled food technology has had a very significant impact on the types of food eaten by consumers during the 1980s and 1990s. This method of food preservation has satisfied the desires of people for safe, reliable, fresh products providing convenience despite the limited shelf-life. This introduction reviews the definition, range and market size of chilled food and indicates trends for the L1 Definition Foods distributed under refrigeration and sold from refrigerator cabinets have been available for many years. Although there were many new chilled product

一、单项选择 1、江泽民在()上阐述了我国社会主义现代化建设中必须正确处理的十二大关系。 A.党的十二届三中全会 B.党的十三届七中全会 C.党的十四届三中全会 D.党的十四届五中全会

Chapter 1 Introduction to the cell Learning Objectives 1. About Cell Biology 2. Look briefly at the history of cell theory; 3. Consider the basic properties of cells; 4. Compare some characteristics of two different classes of cells: prokaryotes and eukaryotes; 5.comprehend a special life: viruses