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TCP is connection-oriented, and a connection must be established between either side before sending data to the other. In TCP/IP protocol, TCP protocol provides reliable connection service, and the connection is initialized by three-way handshake. The purpose of the three-way handshake is to synchronize the serial numbers and acknowledgement numbers of both parties and exchange TCP window size information. The process of shaking hands can be represented by the following figureIndustrial Revolution 2.0-Electrical Age: Since the 1870s, marked by the wide application of electricity, human society has entered the "Electrical Age" and initiated a new mode of mass production of products.In fact, each design pattern is a very important idea, which looks very familiar. In fact, it is because what we have learned is involved. Although sometimes we don't know it, it is actually reflected everywhere in Java's own design, such as AWT, JDBC, collection class, IO pipeline or Web framework, in which design patterns are everywhere. Because of our limited space, it is difficult to talk about every design pattern in great detail, but I will try my best to write down the meaning clearly in the limited space and space so as to make everyone understand better. If there is no accident in this chapter, it should be the last talk of the design pattern. First of all, it should be the figure at the beginning of the previous article:To sum up:《案发现场》反映的是中国北方一个大都市的刑警队，面对“凶杀”、“绑架”、“窃密”、“奸情”、“贩毒”、“网络犯罪”、“谋财”等一个个带有鲜明时代特征的犯罪案件，警探们以丰富的知识，敏锐的目光，缜密的推理，科学的手段和艰苦的调查，一次次准确及时地寻找出犯罪嫌疑人，使案情大白于天下，惩恶扬善，维护社会的秩序和法律的尊严。电视剧《案发现场》主要是宣扬“惩恶扬善”这个中国几千年来的传统。而且剧集中不止一次的提出，中国不是犯罪分子的乐园，所有在中国领土内的犯罪，无论国籍·种族·社会地位·犯罪原因都将会受到中国法律的审判。It is a men's competition. There are two versions of its origin. One is that it originated in Britain and evolved from a children's game in Britain. It was then introduced into the United States by British immigrants and gradually became the national ball of the United States ". The other is that it originated in the United States.卡米拉曾经自杀未遂。 在一天卡米拉和斯科特乘房车旅行。在后来卡米拉和斯科特分手，而迪尼斯和伊冯分手了又重聚。彼得在他的工作室里寻找灵感。 卡米拉在平行世界见到了汤米。在这期间父亲与母亲邂逅。而卡米拉在现实生活中遇见了汤米，，，，