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我们于1989年9月至1989年12月对随机抽取中签的三个自然村的1797名居民进行了肠道寄生虫感染调查,现将结果报告如下:1 材料与方法1.1 标本来源:将全市412个自然村按经济收入高低分为三类,各类用随机的方法抽取
We conducted a survey of intestinal parasites in 1797 residents of three villages randomly selected from September 1989 to December 1989. The results are reported as follows: 1 Materials and Methods 1.1 Specimen Source: The city’s 412 According to the level of economic income, villages are divided into three categories, with all kinds of random extraction method