下面有关数据库系统的特点,正确的有(23)。
①查询迅速、准确;
②数据冗余度较大;
③数据的共享性好;
④具有较高的数据独立性;
⑤数据结构化;
⑥有专门的系统对数据进行统一的管理。
(69)
(70)
(67)
(68)
There is no question that computer applications such as(71), electronic mail, and(72)publishing have changed the way people work. These computer applications have enhanced users capacity for communication and have improved their productivity. The success of these applications has prompted both vendors and researchers to continue to seek new ways to further advance the information technology revolution. Enter the latest innovation: networked(73)systems. They convey information in multiple(74): text, graphics, video, audio,(75), computer simulations, and so forth. Advocates of these systems argue that they are the next logical step in human communication; however, modifying our current networks to accommodate the variety of media will present significant technical difficulties.
(64)
(65)
(63)
(62)
(60)
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