求翻译：采用单纯随机抽样的方法，以湖北科技学院为研究对象，采用回顾性自填问卷的方法对医学和非医学类300名大学生的日常饮食状态进行调查是什么意思？

Using simple random sampling method, Hubei Institute of Technology, retrospective questionnaires on daily dietary status of the 300 students of medical and non-medical investigation

Use a simple random sampling method to Hubei Science and Technology College as the object of study, a review of the self-administered questionnaire on medical and non-medical students to the class 300 status of an investigation into daily diet

Uses the pure random sampling the method, take the Hubei science and technology institute as the object of study, uses the review from to fill in the questionnaire the method carries on the investigation to the medicine and the non-medicine class 300 university student's daily diet conditions

Uses a simple random sampling method, Hubei Institute for the study of science and technology, with retrospective method of questionnaires on medical and non-medical diet of 300 students investigate

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