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问题 单项选择题

以下关于DBAS生命周期模型的基本思想的叙述中错误的是

A)DBAS的生命周期由项目规划、需求分析、系统设计、实现与部署、运行管理与维护等基本活动组成
B)将瀑布模型和螺旋模型的开发思路引入DBAS生命周期模型，允许渐进、迭代地开发DBAS
C)引入了数据组织与存储设计、数据访问与处理设计、应用设计三条设计主线
D)将DBAS设计阶段细分为概念设计、逻辑设计、物理设计三个步骤，第一步的设计内容又涵盖了三条设计主线

答案

参考答案：B

解析： DBAS生命周期模型将快速原型模型和增量模型的开发思路引入DBAS生命周期模型，允许渐进、迭代地开发DBAS。故答案选B。

单项选择题

Modern liberal opinion is sensitive to problems of restriction of freedom and abuse of power. (1) , many hold that a man can be injured only by violating his will, but this view is much too (2) . It fails to (3) the great dangers we shall face in the (4) of biomedical technology that stems from an excess of freedom, from the unrestrained (5) of will. In my view, our greatest problems will be voluntary self-degradation, or willing dehumanization, as is the unintended yet often inescapable consequence of sternly and successfully pursuing our humanization (6) .

Certain (7) and perfected medical technologies have already had some dehumanizing consequences. Improved methods of resuscitation have made (8) heroic effort to "save" the severely ill and injured. Yet these efforts are sometimes only partly successful: They may succeed in (9) individuals, but these individuals may have sever brain damage and be capable of only a less-than-human, vegetating (10) . Such patients have been (11) a death with dignity. Families are forced to bear the burden of a (12) "death watch".

(13) the ordinary methods of treating disease and prolonging life have changed the (14) in which men die. Fewer and fewer people die in the familiar surroundings of home or in the (15) of family and friends. This loneliness, (16) , is not confined to the dying patient in the hospital bed. As a group, the elderly are the most alienated members of our society: Not yet (17) the world of the dead, not deemed fit for the world of the living, they are shunted (18) . We have learned how to increase their years, (19) we have not learned how to help them enjoy their days. Yet we continue to bravely and feverishly push back the frontiers (20) death.

7（）

A.obtained

B.afforded

C.desired

D.offered
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单项选择题

用于电动机直接启动时，可选用额定电压380伏或500伏，额定电流等于或大于电动机额定电流（）的三极开关。

A.1倍

B.2倍

C.3倍

D.5倍
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