investigation in the countryside
investigation in the countryside
农村调查
以上为机器翻译结果,长、整句建议使用 人工翻译 。
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Method: Using stratified cluster sampling, sampling an elementary school respectively in the city and countryside, carries on the check by sight and the correlation factor investigation.
方法:应用分层整群抽样方法,在城市、农村小学中各抽取一所小学,进行视力检查及相关因素调查。
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