(6) 区域机率抽样(area probability sampling)： 第一阶段机率抽样 X 第二阶段机率抽样 = 总机率 A. 挑出1/5 街区 X 挑出1/2家户单位 = 1/10 B.
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Based on the principle of the pollution probability, the atmospheric sampling station was set up on the coastal area of upstream wind side where the pollution probability is the highest.
应用污染几率原则，选择在沿岸地区最大污染几率的上风方位设立大气采样点。
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