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In TCP/IP protocol, TCP protocol provides reliable connection service and uses three-way handshake to establish a connection.尹旭笑道：你这样看好寡人？绿萝嫣然道：奴永远对大王信心满满。It is true that by classifying and recycling different waste packages, waste plastic packages can be prevented from being mixed into domestic waste and the waste treatment cost can be reduced. In many streets and communities, there are also classified garbage bins with the words "recycled" and "non-recyclable" written on them, but it is also very common to throw them away without looking at the classification at all. Li Li said: "The State Council has issued an action plan to promote the recycling of domestic waste. All localities are also working out corresponding implementation plans for domestic waste classification. Beijing has proposed that 90% of the residential areas should be piloted for classified recycling by 2020. I think the vision of building a beautiful China can still be realized as long as the enthusiasm of the public is really called up. "徐有礼是个性格暴躁的倔老头，与老伴高书雅磕绊不断。近来，让老俩口心烦的是三个孩子事业、爱情或婚姻出现了问题。二儿子文健的前女友锦茹从国外回来了，想与文健重修旧好，但文健已经有了新的女友小玲，又不愿伤害锦茹，左右为难。锦茹的哥哥陈勇正在追求文健的小妹雪莹，却遭到徐家两位老人的激烈反对。大儿子文俊不但与陈勇联手做生意，而且与做歌星梦的老婆闹得不可开交雪莹结婚了，文俊与红杏出墙的老婆离了婚，文健的公司遭遇挫折，锦茹出手相救，文健事业出现转机，开始快速发展，而感情的抉择更加艰难。最终，文健与小玲登记结婚，锦茹登上飞机，离开了这座使她伤心的城市。Before performing an event callback, the current component traverses all of its parent components up. Save to this array. Because the DOM structure may be changed in event callbacks, the component hierarchy should be traversed first to prevent conflicts with cached ones. After that, the calls are dropped in turn.Compared with online institutions, first of all, customers have stronger trust in physical institutions; Secondly, offline organizations have a strong scene, making it relatively easier to manage teachers and supervise students' learning. In addition, the teacher-student interaction and student-student interaction in offline institutions are more direct and social. However, due to its strong regionality, its customers are more direct and accurate.1. Motor boats shall give way to the following ships when sailing: