We carried out a dietary investigation of pupils aged 10-11 in Mei county in Shaanxi with level-based community random sample method.
本文采用分层整群随机抽样的方法，调查了陕西省眉县农村10 ~ 11岁小学生的膳食摄入情况。
We carried out a dietary investigation of pupils aged 10-11 in Mei county in Shaanxi with level-based community random sample method.
本文采用分层整群随机抽样的方法，调查了陕西省眉县农村10 ~ 11岁小学生的膳食摄入情况。
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