我们随机发放调查问卷 We randomly issued questionnaires ; We survey a random distribution
方法在不同的城市，随机选择五种不同的人群，采用统一的调查问卷，对目标人群进行问卷调查。
Methods Five different groups of people were randomly selected in different cities in using a unified questionnaire which was carried out in the target population.
方法按照分层随机抽样原则随机抽取部分食品从业人员，匿名独自填写统一的调查问卷。
Method Some food processing employees were selected according to stratified random sampling method, and filled in a unified questionnaire anonymously.
方法随机抽取太原市国师街社区居民200人，采用亚健康状态调查问卷进行调查。
Methods 200 residents were sampled randomly in Guoshi Street community in Taiyuan City, and were investigated by the questionnaire of sub-health.
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