RP3 on sampling signal panel is secondary sampling signal adjusted potentiometer.
取样信号板上rp3为二次电流取样讯号调整电位器。
Methods Stratified cluster sampling was carried out to investigate 312 male physical education teachers aged over 35 years old in 160 primary and secondary schools in Jiaodong peninsula.
方法采用分层整群抽样方法，对胶东半岛160所中小学35岁以上的男性体育教师312人进行问卷调查。
Using self-reported questionnaire and sampling to investigate 1 408 secondary school students in urban area in Beijing.
采取自我报告式问卷，以整群抽样的方法对北京市某城区1 408名初高中学生进行调查。
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