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我们对杭州四大自来水厂水碘及市区学龄儿童尿碘水平进行了检测，结果报告如下。1材料与方法1．1检测对象全市五个区，采用随机整群抽样方法，对不含郊区的上城、下城区各抽取3所小学，对含郊区的江干、拱墅、西湖区每区各抽取1所城区小学和2所乡镇小学，共计15所，每所小学随
We tested the water quality of iodine and urban urinary iodine levels in four waterworks in Hangzhou and the results are reported as follows. 1 Materials and Methods 1.1 Detection of the city’s five districts, using a random cluster sampling method, without the suburbs of Upper City, under the city drawn three primary schools, with the suburbs of Jianggan, Gongshu, West Lake District Each draws a city primary school and two township primary schools, a total of 15, with each primary school