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Structural patterns, as the name implies, discuss the structure of classes and objects and are mainly used to deal with the combination of classes or objects. It includes two types, one is class structure pattern, which refers to the combination of interfaces or implementations by inheritance mechanism. The second is the object structure mode, which refers to the realization of new functions by combining objects. It includes adapter mode, bridge mode, decorator mode, combination mode, appearance mode, element mode and agent mode.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.此时，恰逢战友丁思甜（郝好饰）来信邀请他们去草原做客，二人欣然前往，哪知正赶上牧牛受惊。为寻找丢失的牧牛，三人和牧民老羊皮进入俗称阎王殿的百眼窟。在这里，竟有一些日本“给水部队”的遗迹，一座没有房间的怪楼，一个编号是“0”的地下室更可怕的是，两只全身白毛的黄皮子一直尾随着他们的故事。库珀（瓦耶特·鲁塞尔 Wyatt Russell 饰）是一位喜欢游历世界的青年，某次，旅费吃紧的他参加了一项游戏测试的工作，没想到这份收入优渥的工作却给他的人生带来了毁灭性的打击。2. Candidates are only allowed to carry necessary stationery when entering the examination room. They are not allowed to carry any other articles except black ink sign pens, 2B pencils, erasers and pads. Articles that are not allowed to enter the room are placed in the "small article placement place" set up in the examination room. No stationery is allowed to be transferred to each other in the examination room.Advantages: Delayed loading (loading only when needed)