简介:模型、模拟和对偶熊先平在分析研究自动控制装置或系统时,首先必须建立它的数学模型:在建立模型之后应用于生产实际之前先在实验室中用模拟系统加以研究是必不可少的;如果两个相互模拟的数学模型是属于相同的物理范畴的话,我们又可以用对偶的方法加以研究,这可以大大...
简介:Ⅰ.Choosethebestanswerfroma,d,canddaccordingtothetextsyou’velearntinC.E.BookOne.(15%)1.WhatkindofapersonisIris?(Lesson1)a.Sheisforgetful.b.Sheisverycautious.c.Sheworriesagreatdeald.Alloftheabove.2.AsJaneexplained,Anncouldhavehadfoodinthehotelrestaurantbecause____.(Lesson2)a.thefoodwasexcellentb.itwasverycheapc.everythingwasincludedinthepaekaged.theSpanishfoodwasalmostthesameastheEnglishfood3.Whichcountrymakesthebestpaperintheworld?(Lesson5)a.Canada.b.Sweden.c.Norway.d.Finland.
简介:Ⅰ.GivethefullnameofthefollowinginitialsandtheChineseequivalents.(10%)FDIR&DEDSNYMEXWTOⅡ.Explainbrieflyandclearlythefollowingtermsandexpressions.(20%)riskcapital,licencing,productcycle,serviceseconomy,tradebarriers(tariffandnon-tariffbarriers)Ⅲ.Answerthefollowingquestions.(30%)1.Whydoeseverycountry,atleasteverybigcountry,developortrytodeveloptheautoindustry?2.Howcouldthecapitalinflowofthemultinationalspromotetheeconomyoftherecipientcoun
简介:<正>综合练习A1完形填空(10分)Menfirstmeasuredtime(?)usingastickintheground.Thelengthofthe(?)shadowwould(?)whattimeofdayitwas.(?),theEgyp-tiansusedapillar,(?)asagnomon,andthendevelopedasimplesundial,(?)consistedofastonewithapointeronit.Thestonewasplacedinaneast-westdirection,andtheshadowofthepointershowedthetime.About300BC,aBabylonian(?)Berosusinventedasemi-circularsundial,(?)hemarkedtwelvehours.TheBabylonians,liketheEgyp-