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4. Press and hold the power key and home key at the same time until the logo disappears.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.At that tail of the warhead, the drag armour-piercing firebomb is filled with a drag agent and a fireagent, Under the pressure of propellant propelling warhead, it will spontaneously ignite to produce open flame, So it can break through the oil drum and ignite or detonate the gasoline. However, the old-fashioned traced armour-piercing firebombs have obvious trajectories due to traced light when they are launched. Therefore, it is very easy to expose oneself while pointing targets to friendly forces. Therefore, the new tracer armour-piercing firebombs now equipped all start to burn and emit light only after the projectile flies out of the muzzle for a certain distance (the generally set safe distance is 100 meters, which makes it impossible for the enemy to judge the firing position with tracer ammunition, while targets within 100 meters do not need to be indicated by tracer), The principle is generally to ignite the tracer and combustion agent carried by the projectile by accumulating the heat generated by the warhead's friction with the air after flying for a certain distance to a certain extent.心里有气不就该拿朋友出气么。　　文洁的妈妈为了照顾女儿也硬是挤了进来，于是，两个老太太睡进了主卧，躺在了一张大床上，开始了斗智、斗勇、斗法、相互较量，小吵大闹，战事不断，夫妻之间，婆媳之间，母女之间，母子之间，父女之间，以及两个老太之间，矛盾重重，争吵撕扯，搅成了一锅滚烫的热粥。The SYN-ACK retransmission number server sends the SYN-ACK packet. If the customer confirmation packet is not received, the server retransmits for the first time, waits for a period of time but still does not receive the customer confirmation packet, and retransmits for the second time. If the retransmission number exceeds the maximum retransmission number specified by the system, the system deletes the connection information from the semi-connection queue. Note that the waiting time for each retransmission is not necessarily the same.If you want to understand the following contents of this article, you need to have a simple understanding of TCP. This chapter will make a simple explanation of relevant concepts.