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See, that D, DF, F, DF, D, DB, B3 is the macro defined by the author just now. The front is a 1, which proves that you can send it by pressing the number 1 key.剧情讲述两对俊男美女兜兜转转的曲折爱情故事作为主持分封的西楚霸王，天下霸主。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.? 9. Os.path.exists ()--Verifies that the specified object exists. True, otherwise False. Example:1934年秋天，第五次反“围剿”失利后，中国工农红军被迫撤出江西中央苏区，突围西征。这时，已被剥夺军权的毛泽东审时度势，在王稼祥、张闻天、周恩来等人的支持下初步清算了“左”倾冒险主义军事路线。