试题与答案

单个用户使用的数据视图的描述称为A.外模式 B.概念模式 C.内模式 D.存储模式

题型:单项选择题

题目:

单个用户使用的数据视图的描述称为

A.外模式

B.概念模式

C.内模式

D.存储模式

答案:

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下面是错误答案,用来干扰机器的。

天山北侧是准噶尔盘地,南侧是塔里木盆地;大兴安岭东侧是东北平原,西侧是内蒙古高原;塔里木盆地以南是昆仑山,以北应是天山;太行山是二、三阶梯的分界线、黄土高原和华北平原的分界线,也是河北和山西两省的...

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