If you are looking for information, library shelves are a good place to start. But if you need up-to-the-minute data or have specialized needs, you may find a computerized database more useful, less expensive, and less time 11 .A database, a file of information on one subject or family of subjects, can be stored and 12 in a computers memory. The speed of the computer then 13 you to recall any item in this file almost 14
The three main types of databases are statistical, bibliographic, and full text. Statistical databases store 15 amounts of numerical data, such as wage and price indexes, census information, foreign 16 rates and bond prices. Bibliographic databases store references to and summaries of articles in periodicals and newspapers. Full-text databases offer the complex texts of such 17 as newspaper, magazine, and journal articles.
Thousands of databases exist today, and their numbers are growing. Many companies have their in-house database, which is 18 to employees through computer terminals or microcomputers. In addition, several hundred commercial databases are now available to the 19 , with literally millions of items of information readily obtainable. These databases 20 specific fields, such as law and financial forecasting, or general information, such as sports and weather data.
A. exchange B. public C. instantly D. cover
E. enables F. consuming G. remained H. materials
I. hide J. intensively K. vast L. communications
M. exhausting N. accessible 0. maintained
II. F 12. O 13. E 14. C 15. K 16. A 17. H 18. N 19. B 20. D
GRE词汇分类总结之大屠杀
GRE词汇分类总结之各种剂
GRE词汇分类总结之与名人相关的词
GRE词汇分类总结之表示容忍/赦免的词
GRE词汇分类总结之与狂欢相关的词
GRE词汇分类总结之表示浸透的词
GRE词汇分类总结之标点
GRE词汇分类总结之与装修相关的词
GRE词汇分类总结之与演说相关的词
GRE词汇分类总结之各科医生
GRE词汇分类总结之避难所
GRE词汇分类总结之以ine结尾的动物形容词
GRE词汇分类总结之集市
GRE词汇分类总结之表示蔑视的词
GRE词汇分类总结之与背叛相关的词
GRE词汇积累之-audi词根
GRE词汇分类总结之与伪科学相关的词
GRE词汇分类总结之与胜负相关的词
GRE词汇分类总结之以aunt结尾的词
GRE词汇分类总结之表示裂缝锯齿的词
GRE词汇分类总结之表示懊悔的词
GRE词汇分类总结之表示褶皱的词
GRE词汇分类总结之表示侮辱的词
GRE词汇分类总结之与怒相关的词
GRE词汇分类总结之表示辱骂的词
GRE词汇分类总结之表示伪善的词
GRE词汇分类总结之与欺骗相关的词
GRE词汇分类总结之各种肉
GRE词汇分类总结之与乡村相关的词
GRE词汇分类总结之沼泽/困境
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |