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为了解我区儿童少年发中锌、铜、铁、钙4种元素含量,我们于1988年末至1989年初对2627名1～15岁儿童少年头发进行了测定。结果(附表)4种元素的含量有随年龄增加而逐渐
In order to understand the content of zinc, copper, iron and calcium in children and adolescents in our district, we measured juvenile hair of 2627 children aged 1-15 years from the end of 1988 to the beginning of 1989. The results (Schedule) 4 kinds of elements with the content of the gradual increase with age