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为了解本地区儿童发锌水平和营养性贫血与发锌的关系，我们于1991年4月对哈密铁路地区儿童进行了发锌含量及贫血调查。现报告如下：1材料与方法1．1调查对象：用随机抽样的方法，抽取哈密铁路地区幼儿园和第一小学的2～14岁的正常儿童493人为调查对象。1．2采样方法及样品处理?
In order to understand the relationship between hair zinc levels and nutritional anemia and hair zinc in children in this area, we conducted a survey on zinc content and anemia in children in the Hami Railway area in April 1991. The report is as follows: 1 Materials and Methods 1.1 Survey: Random sampling method, the Hami Railway District kindergarten and primary primary school 2 to 14-year-old normal children 493 were drawn from the survey. 1.2 sampling methods and sample processing?