网络体系结构是计算机之间相互通信的层次,以及 各层中的协议和层次之间接口的集合。网络协议是 计算机网络和分布系统中互相通信的对等实体间交 换信息时所必须遵守的规则的集合。 协议的关键成分是: 语法(syntax):包括数据格式、编码及信号电 平等 语义(semantics):包括用于协调和差错处理的 控制信息 定时(timing):包括速度匹配和排序等

一、简要的介绍了 GOOGLE的历史和特点, 二、GOOGLE的基本搜索语法和高级搜索语法, 三、GOOGLE的特色功能,包括图片搜索、新闻组搜索和集成工具条等, 四、简单的介绍了一些常用搜索技巧和实用个案

SACHUSE Massachusetts Institute of Technology Harvard Medical School Brigham and Women's/Massachusetts General Hosp

一、填空(本题25分) 1.共射共集共基 2.饱和区截止区放大区正偏反偏 3.锗PNP集电基射 4.提高降低加宽减小增大 5.多级放大电路单级放大电路

一、填空(本题25分) 1.互导互导增益互阻AR=o 2.饱和区截止区放大区正偏反偏 3.GB≥50MHz 4.提高降低加宽增大减小

一、填空(本题28分) 1.PN结的伏安特性方程i= ,表明PN结 导电性。 2.放大电路中,已知三极管三个电极的对地电位为UA=-9V,UB=-6.2V, Uc=-6V,则该三极管是 型三极管,A为 极, B为 极,C为 极

Lecture 1 The communication perspective on education Education as field and multi- perspectives The common course and necessary stages of education and communication Educational technology and communication Our plan

Changes in the Nature of Work The Interweaving of Technology and Jobs Changes in the Design of Jobs (there will be no stable jobs in the future Integration of Contingent Workers into the Workforce Increased Emphasis on Continuous Learning External Control of Performance Standards by Customers

Product development has been a major activity in the food industry for over 40 years, but only gradually has it developed as a strategic business area and also as an advanced technology. For a long time it was essentially a craft, loosely related to the research and engineering areas in the company. The pressures for product development came very strongly from the needs of the growing supermarkets for a constantly changing, extensive mix of products and for continuous price promotions. So there was the drive for product difference

Overview of Pulsed Radars. Critical Subsystem Design and Josh T.Nessmith Technology. Radar Performance Prediction.Radar Georgia Tech Research Institute Waveforms. Detection and Search Estimation and Tracking