elementary survey sampling
...文名：应用微积分: 管理,生命科学及社会科学专业适用) Elementary Survey Sampling (初级抽样调查) Elementary Survey Sampling (中文名：初级抽样调查) ..
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elementary survey sampling
基本调查抽样
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Methods With the equal proportion sampling, 5,489 elementary and middle school students were selected to test the visual acuity and a questionnaire survey was conducted among them.
方法采用等比抽样法对宝鸡市5 489名中小学学生进行了视力测试和问卷调查。
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