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1988年5～7月,对忻州市城区三所日托幼儿园(行署、忻州市、居委会)3～6岁682例健康幼儿头发和尿中锌含量的测定。发样用不
From May to July 1988, the hair and urinary zinc contents of 682 healthy children aged 3 ~ 6 years old in three nursery schools in Xinzhou city (Administrative Office, Xinzhou City and neighborhood committees) were measured. Do not use hair samples