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实现有效的问题设计是教学中的关键。论述了问题设计的基本要素，通过实例说明层次性的问题设计引发学生的认知冲突和思维冲突，从而培养学生的思维品质。“,”Achieving effective design problems is the key to teaching. This paper discusses the basic elements of design problems, Through examples of hierarchical design problems caused cognitive conflict and conflict thinking of students, in order to cultivate the quality of students ’ thinking.