简介:本文论述了基于J2EE多层结构的Web应用系统的系统构架,并详细介绍了西北工业大学软件学院教务管理系统(B端)的系统设计和关键技术的实现.
简介:Inmylife,Ishouldsaymyfatherhasinfluencedmemost.WhenIwasachild,myfathertoldmeIshouldlearntotakecareofmyself.SoIhadtogotoschoolbymyself,cleanthebedroomformyselfandevenmakestudyplansformyself.InfactIdidn’tunderstandwhymyfatherdidthattome.Ithoughtheshouldtake
简介:Inthe13thcentury,MarcoPolotraveledalongwaytoChina.HewasafamousItalian1.DuringhisstayinChina,hesawmanywonderfulthings.Oneofthethingshe2wasthattheChineseusedpapermoney.Peoplein3countriesdidn’tusepapermoneyuntilthe17thcentury.However,peopleinChinabegantousepapermoneyinthe10thcentury.4wasinventedbyaChineseabout2,000yearsago.HisnamewasCaiLun.Hethen5thesepiecesofpapertogetherandmadethemintoa6.Nowpapermainlycomesfromtrees.Weuseiteveryday.Sometimeswewastealotofit.Ifwekeepondoingso,peoplehavetocutdownmanymoretrees.Thentherewillnotbeanytreesleft.Ifthereareno7,therewillbenopaper.