试题与答案

在经济分析中,根据不同的市场结构特征,可以将市场划分为不同的类型。决定市场类型的主要

题型:多项选择题

题目:

在经济分析中,根据不同的市场结构特征,可以将市场划分为不同的类型。决定市场类型的主要因素有( )。

A.市场上厂商的数量

B.产品的差别程度

C.单个厂商对市场价格的控制程度

D.厂商进入、退出市场的难易程度

E.市场上产品的数量

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析: 根据该表的语法,S#和C#数据类型为字符型,字符型数据需加引号,所以A),C)不能插入。另外,在关系SC中,(S#,C#)是主键,不允许有相同的值,所以D)不能插入。

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题型:阅读理解

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