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最近,我们采用分层抽样调查方法对我校各年级147名学生在体育锻炼中发生的急症进行了调查,现统计列表并对处理方法作如下说明:
Recently, we conducted a stratified sampling survey to investigate 147 students of all grades in our school who had taken part in physical exercises. The questionnaires are now tabulated and the treatment methods are as follows: