secondary sampling unit 次级抽样单位 ; 二极抽样单位
SSUS Secondary Sampling Units 二级抽样单位
Secondary sampling designs 二次布点
secondary dry sampling equipment 第二级干法取样设备
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。
METHODS Survey of secondary water supply facilities and sanitation management status in community, sampling collected 256 water samples were sent to laboratory testing.
方法对物业小区内二次供水设施的基本情况和卫生管理现状进行调查，抽检采集水样256份送实验室检测。
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