以下说法中,正确的是______。 A) 从结构的角度看,数据仓库主要有数据集市、企

题型:单项选择题

问题:

以下说法中,正确的是______。

A) 从结构的角度看,数据仓库主要有数据集市、企业仓库和用户仓库3种模型
B) 数据挖掘就是要智能化和自动化地把数据转换为有用的信息和知识
C) OLAP技术为提高处理效率,必须经过DBMS直接对物理数据进行读取和写入
D) 数据仓库是从数据库中导入大量的数据,并对结构和存储进行组织以提高查询效率

考点:计算机等级考试数据库工程师计算机数据库工程师
题型:单项选择题

下列标点使用有错误的一项是(    )(2分)

A.如何解决农村 “留守儿童”的教育问题,早已引起有关部门的高度重视。

B.“我……我……我什么时候骗过你?”他问得很突然。

C.加拿大作家爱丽丝·门罗第一部短篇小说集的题目是《快乐影子舞》。

D.在莫斯科发表演讲的习 * * * * ,给俄罗斯学生留下了睿智、大气的印象。

题型:单项选择题

(2011安徽,12,5分)根据里氏震级的定义,地震所释放的相对能量E与震级n的关系为E=10n,那么9级地震所释放的相对能量是7级地震所释放的相对能量的倍数是               

题型:单项选择题

(6分)把淀粉和NaBr溶液装入半透膜袋,浸入蒸馏水中进行渗析。试回答:

(1)证明淀粉未透过半透膜而Br-已透过半透膜的实验方法是__________________________。

(2)证明淀粉与NaBr已分离完全的实验方法是______________________________________。

题型:单项选择题

Losing a job or not being able to find one almost always brings unwelcome changes. If you’ve lost a job, the first feeling is often one of shock. On top of the loss of income, many people find the whole routine of their life is shattered, their contact with other people reduced, their ambitions halted and their identity as a worker removed.
There may be good feelings too -- it’s nice to be able to lie in bed in the morning, to spend more time with children, or to have more time to think -- a better job may be just around the comer. But, unless a better job does turn up, chances are the days start getting longer and the time becomes harder to fill. Many people pass through periods of difficulty in sleeping and eating. They feel irritable and depressed, often isolated and lonely.
Despite all these problems, unemployment can be a chance for a fresh start. You can discover that it provides an opportunity to sort out or rethink what you want from life and how best you can get it. You can use the time to plan how to find a new job, learn a new skill, develop your hobbies, see if you can run your own business, do some voluntary work in your community or meet new people. It’s up to you.

Unemployment almost always brings changes that are ______.

A.unpleasant

B.unsuitable

C.untenable

D.unworthy

题型:单项选择题

企业2006年12月20日向乙企业销售一批商品,已进行收入确认的有关账务处理,2007年2月1日,乙企业收到货物后验收存在质量问题要求退货,经协商2月10日甲企业给予折让300万元。甲企业年度资产负债表批准报出日是4月30日。甲企业对此业务的处理是( )。

A.作为2006年资产负债表日后事项的调整事项

B.作为2006年资产负债表日后事项的非调整事项

C.作为2007年差错更正事项

D.作为2007年当期正常事项

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