Methods 7 ones for rural workers' children from all the 42 primary schools in the district have been surveyed through random sampling.
方法采用分层随机整群抽样的方法，从全区42所民工子弟小学中抽取7所学校，通过问卷调查的形式对学生展开调查。
Methods The inhabitants of 8 communities in 4 different regions of Lanzhou were sampled by random sampling and the questionnaires that were filled in through the way of interview were collected.
方法采取随机抽样的方法对兰州市4个城区8个社区的常住居民进行面对面入户式问卷调查。
Methods an investigation was conducted through asking by random sampling the nursing staff to answer the questionnaires distributed to them.
方法采取随机抽样填写发放的问卷的方式进行调查。
Methods A total of 7482 residents aged 15-69 selected in representative 30 counties through multi-stage random sampling from Zhejiang Province were surveyed by using questionnaire.
方法采用多阶段随机抽样的方法，在浙江省有代表性的30个县区，对7482名年龄在15～69岁的居民进行面对面问卷调查。
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 By random sampling, 175 Cases of in-patients were given transfusion through unilateral upper Limb.
方法随机抽取住院患者175例，均采用一侧上肢输液。
Methods By random sampling, 175 Cases of in-patients were given transfusion through unilateral upper Limb.
方法随机抽取住院患者175例，均采用一侧上肢输液。
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