【简答题】【消耗次数：1】
在数据库概念结构设计中，各分E-R模型之间的冲突主要有：属性冲突、[填空]和结构冲突。
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【简答题】
数据库设计的步骤主要有需求分析、概念结构设计、[填空1]、物理结构设计 、数据库实施、数据库运行与维护6大步骤。
【简答题】
E-R数据模型一般在数据库设计的[填空]阶段使用。
【单选题】
概念结构设计的主要目标是产生数据库的概念结构，该结构主要反映( )
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②
B．DBA的管理信息需求
③
C．数据库系统的维护需求
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D．企业组织的信息需求
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____ he tried his best , he still failed the examination.
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Although
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Even although
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However
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The research results show that the earth goes a little faster ____ it is closer to the sun.
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when
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so that
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kept to
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took to
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went to
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I have nothing to say____ your complaints.
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as a result of
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in addition to
③
with regard to
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on behalf of
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____ gostraightontouniversity,whynotgetsomeworkexperiencefirst?
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Better than
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Other than
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More than
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Rather than
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If we work with a strong will, we can overcome any difficulty, ____ great it is.
①
what
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how
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however
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whatever
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The great noise produced by the machine will sooner or later do ____ to the workers’ hearing.
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damage
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help
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wrong
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harm
【单选题】
The seller gave men a thirty percent ____on the shirt. Don’t you think it’s a good bargain?
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discount
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treatment
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decrease
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favor
【单选题】
It is a waste of time ____with such a silly fellow.
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trying to reason
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tried to reason
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for trying to reason
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to trying reasoning