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七选五: You may think that English dict ionaries have been used for many,many centuries.The spelling of English has always been a problem. 1 Then people could spell words in different ways which you might find interesting.But it made reading English much more difficult.So dictionaries were invented to encourage everybody to spell the same.In fact,an English dictionary like the kind you use today wasn’t made until the time of the late Qing dyn asty. 2 They are Samuel Johnson,Noah Webster,and James Murray.These men spent nearly all of their lives trying to collect words for their dictionaries.For them,it was not only a job,but it was a wonderful journey of discovery.The largest dictionary in the world is the Oxford English Dictionary,or OED for short. _____ 3 ____At the age of fourteen,he left his village school in Scotland and taught himself while working in a bank.Later he became a great teacher.After Oxford gave him the job,Murray had a small house built in the garden behind his house to do his work.Part of it was one meter underground. 4 He had to wear a heavy coat and put his feet in a box to keep warm.Every morning,Murray got out of bed at five o’clock and worked several hours before breakfast. 5 Murray hoped to finish the new dictionary in ten years.But after five years,he was still adding words for the letter A! Forty-four years later,in 1928,other editors finished the dictionary. A.In winter it felt like a barn. B.Murray had never been to college. C.He worked on the dictionary until he was very old. D.Often he would work by candle light into the evening. E.But it was more of a problem in the days before a dictionary. F.Three men did most of the important early work on dictionaries. G.The idea of this dictionary came from an important meeting in Britain in 1857.
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举一反三
【单选题】在数据库系统中数据模型有三类,它们是( )。
A.
实体模型、实体联系模型、关系模型
B.
层次模型、网状模型、关系模型
C.
一对一模型,一对多模型,多对多模型
D.
实体模型,概念模型,存储模型
【单选题】. 数控机床的故障按故障特征分类,可分为 ( ) 和有报警故障两大类。
A.
随机性故障
B.
无报警故障
C.
可恢复性故障
D.
机械故障
【判断题】湘绣制作中的独特现象是绣工多为男工。
A.
正确
B.
错误
【单选题】某企业“原材料”期末余额100 000元,“生产成本”期末余额50 000元,“库存商品”期末余额120 000元,“存货跌价准备”期末余额10 000元。则资产负债表“存货”项目应填列的是(  )元。
A.
300 000
B.
260 000
C.
280 000
D.
270 000
【判断题】湘绣制作中的独特现象是绣工多为男工。( )。
A.
正确
B.
错误
【单选题】数据库系统中数据模型有()三种
A.
大型、中型和小型
B.
环状、链状和网状
C.
层次、网状和关系
D.
数据、图形和多媒体
【单选题】数据库系统中的数据模型有三种,下列 不是数据库系统采用的数据模型
A.
网状模型
B.
层次模型
C.
总线模型
D.
关系模型
【简答题】数据库系统中常用的三种数据模型有层次模型、()和()
【简答题】数据库系统的三级模式结构包括哪三级模式?关系数据库系统是常用的数据库系统,关系模型中有哪三类完整性约束?
【简答题】数据库系统中常用的三种数据模型有层次模型、网状模型和______。
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