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TCP works in the Transport layer, IP in the Network layer, and ARP in the DataLink layer; The data on the second layer is called Frame, the data on the third layer is called Packet, and the data on the fourth layer is called Segment. At the same time, we need to simply know that when data is sent from the application layer, header information will be added to each layer, encapsulated, and then sent to the data receiving end. This basic process you need to know, that is, every data will go through the process of data encapsulation and unencapsulation.Specifically, in 2016, the proportion of product research and development categories such as CAD, CAE, CAM and CAPP in China's industrial software industry is about 8.3%, while the proportion of information management categories such as ERP, CRM and HRM is about 15.5%. Production control categories such as MES, PCS and PLC account for about 13.2%. The remaining 63% are embedded software development.Walk 200 kilometers along the border to another village. There was a Kirgiz grandfather who told me that it was not enough to walk along the border to protect the border.9-9 Battery Upgrade: In the last version of electric_car. Py in this section, add a method named upgrade_battery () to the Battery class. This method checks the battery capacity and sets it to 85 if it is not 85. Create an electric car with the default battery capacity, call the method get_range (), then upgrade the battery, and call get_range () again. You will see that the range of this car has increased.该节目由郭碧婷与向佐、严屹宽与杜若溪、若风与戚蓝尹展现新婚生活，并由李维嘉、大张伟两位情感观察员陪同三对明星夫妇的家长与明星观察团一同围观自家子女的婚姻生活，了解子女的婚姻相处模式，探寻中国式婚姻的幸福密码。Two implementations:据日媒消息报道，女演员·滨边美波主演的电视剧《DOCTOR White》的特别篇将于3月28日22点15分在关西电视台·富士电视台系播出。故事梗概和场面照片也解禁了。