试题与答案

在数据库管理系统的层次结构中,数据存取层处理的对象是单个______。它是将上层的集

题型:填空题

题目:

在数据库管理系统的层次结构中,数据存取层处理的对象是单个______。它是将上层的集合操作转化为单记录操作。

答案:

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A.intoB.belowC.acrossD.through
小题2:
A.only if B.as ifC.what ifD.even if
小题3:
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