本章中，我们将重点对小型和中型的 C a t a l y s t交换机加以讨论，这些交换机的型号一般都 小于Catalyst 5000。其中，Catalyst 1900是型号最小的交换机，而且，就交换机每个端口的价 格来说，它也是最便宜的交换机。 Catalyst 2820比Catalyst 1900稍微大一点，它的带宽也比前 者宽一些

考察一般线性方程组 +a12x2++ainn=b , ① ax1+a32x2+…+=b 其中x1,x2,xn为未知量,s为方程个数 a(i1,2,sj=1,2,n)称为方程组系数: b(i=1,2,s)称为常数项

I guess if you had to pick one thing out that is most important in our environment, I’d say it’s not the tools that we use, it’s the people. The most important ingredient that was successful on this project was having smart people… very little else matters in my opinion…The most important thing you do for a project is selecting the staff…

Conduction of Electricity Ohm’s Law Non-linear Resistors Resistors Connected Kirchhoff’s Lawss Substitution Theorem Mesh Current

7-1应力状态概述 (Concepts of stress-state) 7-2平面应力状态分析-解析法 (Analysis of plane stress-state) 7-3平面应力状态分析-图解法 (Analysis of plane stress-state) 7-4三向应力状态分析 7-5平面应变状态分析 (Analysis of plane strain-state) 7-6广义胡克定律 (Generalized Hook's law) 7-7复杂应力状态的变形比能 (Strain-energy density in general stress-state 7-8强度理论(Failure criteria) 7-9莫尔强度理论 (Mohr's failure criterion)

§9-1 压杆稳定的概念 (The basic concepts of columns) §9-3 其它支座条件下细长压杆的临界压力 (Euler’s Formula for other end conditions ) §9-2 两端铰支细长压杆的临界压力 (The Critical Load for a straight, uniform, axially loaded, pin-ended columns) §9-4 欧拉公式的应用范围•经验公式 (Applicable range for Euler’s formula • the experimental formula ) §9-5 压杆的稳定校核 (Check the stability of columns) §9-6 提高压杆稳定性的措施 (The measures to enhance the columns stability)

一、全通函数 全通：幅度特性为常数。对所有频率的正弦信号按相同的幅度传输系数通过。 全通函数的特征：极点位于s左半平面。零、极点关于jw轴镜像对称

1.设计要求 控制8个LED进行花式显示，设计4中显示模式： S0:从左到右逐个点亮LED; S1:从右到左逐个点亮LED;

汽车制动效能，是指汽车迅速降低车速直至停车的能力。汽车制动效能的评价指标是制动距离S（单位m）和制动减速度 （单位m/s2）

3-1惯性系S′相对惯性系S以速度u运动.当它们的坐标原点O与O重合时,t=t=0,发 出一光波,此后两惯性系的观测者观测该光波的波阵面形状如何?用直角坐标系写出各自观 测的波阵面的方程