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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.3. Use object instead of string to record the current state, which makes the state switching more clear at a glance.Let's take the figure as an example to see which tables all the rules on the prerouting "chain" exist in.Before 17:00 on June 24Cracking Process Reference Post拥有盟主，对于这部书，以及其作者而言，也是一件非常荣耀的事。2716