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 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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