贸易逆差是指一定时期内一国的进口值大于出口值。( )
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王某、张某和董某同为一个单位的职工,三人不约而同的投保了各自满意的险种。 董某遭受意外事故以前投保了一份投资连结保险,风险保额为2万元,死亡给付金额为风险保额与投资账户价值之和。投资账户中的初始资金为8万元,用于购买价格为10元的投资单位。若投资单位价格下跌为每单位8元,则董某投资账户中的余额为()万元。
A. 8.0
B. 6.4
C. 6.0
D. 5.6
该图书管理系统的主要关系模式如下,请补充“借还记录”关系中的空缺。管理员(工号,姓名)读者(读者ID,姓名,电话,E-mail)书目(1SBN号,书名,作者,出版商,出版年月,册数,经办人)图书(图书ID,ISBN号,存放位置,状态,经办人)借还记录( (a) ,借出时间,应还时间,归还时间)注:时间格式为“年.月.日时:分:秒”。
(三) 甲城市至乙城市的高速公路即将贯通,经过市场调查与预测,甲、乙两城市之间的年日均班车客运量将达1680人次,由于两城市经济发展水平相当,往返客运量基本平衡。两城市运输距离为250千米。预期正式运行后车辆当日往返,平均车日行程500千米,运营车辆的单车额定载客量为50人。为了规范旅客运输市场经营秩序,以车辆工作率为80%、车辆实载率为70%的效率指标作为控制参营车辆数量的依据。 若按控制车辆效率指标计算,应投放50座客车______台才能实现甲、乙两城市之间班车客运运力与运量的基本平衡。
A. 17
B. 21
C. 25
D. 30
E. 60
The Popularity of EnglishⅠ. Present status of EnglishA. English as a native/first languageB. English as a lingua franca: a language for communicationamong people whose(1)are differentC. Number of people speaking English as a first or a second language:— 320—380 million native speakers— 250—(2)million speakers of English as a secondLanguageⅡ. Reasons for the popular use of EnglishA. (3)reasons— the Pilgrim Fathers brought the language to America;— British settlers brought the language to Australia;— English was used as a means of control in(4)B. Economic reasons— spread of(5)— language of communication in the international business communityC. (6)in international travel— use of English in travel and tourism— signs in airports— language of announcement— language of(7)D. Information exchange— use of English in the academic world— language of(8)or journal articlesE. Popular culture— pop music on(9)— films from the USAⅢ. Questions to think aboutA. Status of English in the futureB. (10)of distinct varieties of English 9()