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The technical scheme further optimized by the utility model is that the connecting piece is a fixing bolt.Practical purposes: College students' popular science activities in rural areas, go deep into the countryside to carry out investigation activities such as environmental sanitation status investigation, villagers' attitude investigation towards the new rural cooperative medical system, popular science knowledge investigation, etc., to publicize scientific planting knowledge and improve environmental protection awareness. At the same time, let college students really go out of the school gate, contact with the society, understand the national conditions, increase their knowledge and get exercise in practice, put the knowledge learned in the school into practice, increase social experience, so as to better participate in public health work in the future.这事就由你们几个出面操办。我想他们来的人定然不会多，两千人足够应付了。+ ` + K. e3 g $s? /s% E F% OCan be instantiated and instantiated once.