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为了解兰州市大学生发中铜、锌、锰、镍、钴、铁、镉、铬、铅9种微量元素的含量。对兰州市116名18—23岁大学生笔者采用随机抽样方法进行了调查。
In order to understand the contents of nine trace elements in copper, zinc, manganese, nickel, cobalt, iron, cadmium, chromium, and lead in college students in Lanzhou City. 116 authors aged 18 to 23 in Lanzhou were investigated by random sampling.