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我们于1989年10月在市区11所幼儿园对健康儿童进行随机抽样调查890名,测定其头发中铁、锌、铜元素的正常值,现报道如下: 1 资料与结果 1.1 调查对象选择蚌埠市区不同环境和不同地理位置的11所幼儿园,幼儿身高、体重均在正常范围,体检正常,无各种慢性疾病。随机抽
We conducted a random sample survey of 890 healthy children in 11 kindergartens in the urban area in October 1989 to determine the normal values of iron, zinc and copper in their hair. The results are reported as follows: 1. Data and Results 1.1 Survey respondents chose Bengbu 11 different kindergartens and nurseries with different environments and geographical locations have normal height and weight, normal physical examination and no chronic diseases. Random pumping