单项选择题

数据设计的概念结构阶段，表示概念结构的常用方法和描述工具是

A．层次分析法和层次结构图
B．数据流程分析法和数据流程
C．结构分析法和模块结构图
D．实体―联系方法和E-R图
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Which of the following statements is true regarding simple sort techniques
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