题型：问答题 简答题 人们在管理实践中发现，数据库技术是信息资源的整理、保存、管理和使用的最有效的手段。数据库按其数据结构模型分类，通常可分为层次型数据库、网络型数据库、关系型数据库和面向对象型数据库。各种类似的数据模型都有自身的特点。试从关系数据模型的优点和弱点论述：为什么人们在开发以事务处理为主的信息系统(例如管理信息系统)时，大多选用关系型数据库作为开发环境 查看答案
题型：问答题 简答题 完形填空。 The measure of a man's real character is what he would do if he knew he would never be found out. Thomas Macaulay Some thirty years ago, I was studying in a public school in New York. One day, Mrs NanetteO'Neill gave an arithmetic__1__to our class. When the papers were__2__,she discovered thattwelve boys had made the same mistakes throughout the test. "There is really nothing new about__3__in the exams. Perhaps that was why Mrs O'Neill__4__even say a word about it. She only asked the twelve boys to__5__after class. I was oneof the twelve.Mrs O'Neill asked__6__questions, and she didn't__7__us either." She wrote on the blackboard the__8__words by Thomas Macaulay. She then ordered us to__9__these wordsinto our exercisebooks one hundred times. I don't__10__about the other eleven boys. Speaking for myself I can say: it was the most importantsingle__11__of my life. Thirty years after being introduced to Macaulay's words, they__12__seem to me the best yardstick(准绳), because they give me a__13__to measure myself rather than others.__14__of us are asked to make__15__decisions about nations going to war or armies going to battle. But all of us are called__16__daily to make a great many personal decisions.__17__the wallet, foundin the street, be put into a pocket or turned over to the policeman? Should the__18__change received at the store be forgotten or__19__? Nobody will know except__20__. But you have to live with yourself, and it is always better to live with someone you respect.( )1.A. test ( )2.A. examined( )3.A. lying ( )4.A. didn't ( )5.A. come ( )6.A. no ( )7.A. excuse ( )8.A. above ( )9.A. repeat ( )10.A.worry ( )11.A. chance ( )12.A. even ( )13.A. way ( )14.A. All ( )15.A. quick ( )16.A. out ( )17.A. Should ( )18.A. extra ( )19.A. paid ( )20.A. me B. problem B. completed B. cheating B. did B. leave B. certain B. reject B. common B. get B. know B. incident B. still B. sentence B. Few B. wise B. for B. Must B. small B. rememberedB. you C．paper C．marked C. guessing C．would C. remain C. many C. help C．followingC．put C. hear C. lesson C. always C．choice C．Some C. great C．up C. Would C．some C. shared C. us D．lesson D. answered D．discussingD. wouldn't D. apologize D. more D. scold D. unusual D. copy D. talk D. memory D. almost D. reason D．None D．personal D．upon D. Need D. necessary D．returned D. then 查看答案