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【简答题】
数据模型是用来表示实体及实体间联系的。网状模型、层次模型和关系模型都是数据库中的基本数据模型。在实体及实体间联系的表示方法上，网状模型可采用______，层次模型可采用______，关系模型则采用______。
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举一反三
【单选题】What is required of those who want to be university teaching assistant?
A.
A good knowledge in information technology.
B.
A college degree in the right field.
C.
The right licenses in education.
D.
Full-time teaching experience.
【简答题】人体最大的消化腺是___ __。
【简答题】消化系统是由______和消化腺组成的．______是最大的消化腺．
【简答题】直接开口于消化道（即无导管）的消化腺为______、______．最大的消化腺为______．
【单选题】What is true about knowledge management?
A.
As baby boomers retire at an increasing rate, knowledge management is helping organizations capture their knowledge.
B.
A knowledge management system is not a single technology but a collection of technology-based tools.
C.
Finding the right technology to manage knowledge assets is much easier than identifying what knowledge is needed, why it is needed, and who has this knowledge.
D.
All of the above are true.
【单选题】What is the purpose of knowledge management?
A.
Using knowledge whenever necessary
B.
Storing knowledge
C.
Recreating knowledge
D.
Updating knowledge
【单选题】What is the definition of a 'theory'?
A.
It's a reasonable explanation of known knowledge related.
B.
It is the product of a scientist's imagination.
C.
It results from previous theories.
D.
It can't predict events that have not as yet been observed.
【简答题】消化系统是由________和消化腺组成的。________是最大的消化腺。
【单选题】What is the feature of a knowledge economy ?
A.
People have to receive higher education to qualify for a professional position.
B.
Students majoring in liberal arts usually have difficulty securing a job.
C.
New positions are constantly created that require people to keep learning.
D.
Colleges find it hard to teach students how to cope with the changing economy.
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