Method 15 hospitals and 2 937 residents were selected and studied through random and systematic sampling methods in Hainan Province.
方法 采用分层抽样和随机抽样方法对15家 医疗机构和2 937名疟区居民进行流行病学调查。
Methods Systematic sampling method was used in field Oncomelania investigation, and laboratory and field simulating drowning methods were also performed to observe survival of Oncomelania.
方法应用系统抽样法进行现场查螺，现场和实验室模拟水淹实验观察钉螺存活情况。
A method of systematic sampling has been adopted for Ailuropoda melanoleuca in Foping Nature Reserve.
已对佛坪自然保护区的大熊猫采用系统采样的方法。
A method of systematic sampling has been adopted for Giant panda (Ailuropoda melanoleuca) in Foping Nature Reserve.
已对佛坪自然保护区的大熊猫采用系统采样的方法。
Systematic community investigation into street trees in Shenyang was carried out using typical sampling method.
采取典型抽样的方法对沈阳市行道树进行了全面的群落调查。
A method of systematic sampling has been adopted for Giant panda ( Ailuropoda melanoleuca) in Foping Nature Reserve.
采用系统抽样方法对佛坪自然保护区大熊猫的夏季栖居地进行了研究。
Methods 445 people living on minimum subsistence allowances in Xuzhou were selected by the method of systematic and cluster sampling with face to face inquiry and household survey.
方法采用系统和整群抽样的方法抽取徐州市低保人员445人，以面对面询问方式进行入户调查。
Methods 445 people living on minimum subsistence allowances in Xuzhou were selected by the method of systematic and cluster sampling with face to face inquiry and household survey.
方法采用系统和整群抽样的方法抽取徐州市低保人员445人，以面对面询问方式进行入户调查。
应用推荐