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举一反三
【单选题】Economic models
A.
are essentially different from those used in other sciences.
B.
always use graphs.
C.
simplify reality.
D.
include all relevant facts.
【简答题】在数据库技术中使用数据模型的概念来描述数据库的结构和语义。数据模型有概念数据模型和结构数据模型两类,实体联系模型(E-R模型)是【 】数据模型。
【判断题】生涯发展论”的第一要素“必修”就是每个不同的年龄阶段都有相同的必须完成的任务。
A.
正确
B.
错误
【单选题】Traditional economic models found it hard to explain the phenomenon of .
A.
search frictions
B.
unemployment
C.
labor as commodity
D.
wage falls
【单选题】国际锡协定曾采用的稳定价格的办法是
A.
缓冲库存
B.
出口配额
C.
多边合同
D.
出口配额与缓冲库存相结合
【单选题】Economic models
A.
cannot be useful if they are based on false assumptions.
B.
were once thought to be useful, but that is no longer true.
C.
must incorporate all aspects of the economy if those models are to be useful.
D.
can be useful, even if they are not particularly realistic.
【多选题】数据模型的结构有( )。
A.
结构化数据
B.
非结构化数据
C.
半结构化数据
D.
完全结构化数据
【单选题】电缆转弯时弯曲半径应符合规定,屏蔽4对对绞电缆的弯曲半径至少为电缆外径的( )。
A.
4倍
B.
6倍
C.
8倍
D.
10倍
【单选题】Economic models
A.
are not useful because they omit many real-world details.
B.
are usually composed of diagrams and equations.
C.
are useful because they do not omit any real-world details.
D.
contribute very little to economists’ understanding of the real world.
【多选题】数据模型的结构有__________。
A.
结构化数据
B.
非结构化数据
C.
半结构化数据
D.
完全无结构化数据
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