Through random sampling methods,investigate and research the medical staff′level of knowledge about AIDS diagnosis,the medical and health administrative leaders′concern degree about AIDS diagnosis capability,the system, interface,management,and so on of AIDS diagnosis performed by medical and health institutions,the general condition of laboratory department including staff,equipment, quality control,and so on,the medical institutions′comprehension and execution of AIDS diagnosis program.
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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。
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