我市向阳小学设立了两个弱智学生班，招收一些由于遗传、疾病等造成大脑发有障碍或大脑受损伤而致弱智的儿童．为了解这些学生发中锋、铜、铁、锰等微量元素的含量以及与正常学生发中这些微量元素含量之间是否存在差异，我们做了调查分析．1对散与方法1．1对象我们抽取两个弱智 The city of Xiangyang Primary School set up two mentally handicapped students classes, recruit some as a result of genetic, diseases, such as the brain caused by obstacles or brain damage caused mentally retarded mentally handicapped children. In order to understand whether there is any difference between these students ’centers, the content of trace elements such as copper, iron, manganese and the content of these trace elements in normal students’ hair, we conducted a survey and analysis. 1 Dispersion and Method 1.1 Object We draw two mentally handicapped