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Second handshake: when the server receives syn packet, it must confirm the SYN (ack=j+1) of the customer, and at the same time it also sends a SYN packet (syn=k), that is, SYN + ACK packet. At this time, the server enters the SYN_RECV state;The paper of the book in Grandma Lily's hand has already yellowed and seems to have been yellowed for some years.　　当时市区发生的火灾现场可能会引起更大的爆炸，就在千钧一发之际，徐天冒死冲进火海，找到正欲逃离的老工程师，一同排除了技术故障，保住了整个城镇。可为此却延误了时机，造成老工程师夫妇均葬身火海……The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.雨雨风风花花叶叶年年暮暮朝朝。历经数年牢狱之灾，影子（瑞奇·惠特尔 Ricky Whittle 饰）终于迎来重获自由的时刻，可是他并不因此而快乐。妻子劳拉（艾米莉·布朗宁 Emily meijubar.net Browning 饰）数日前死于车祸，回家路上又遭遇自称“星期三”（伊恩·麦柯肖恩 Ian McShane 饰）的男人的不断纠缠。最终，影子受雇于星期三，成为对方的保镖。原来星期三的真实身份是北欧之神奥丁，由于现代文明的飞速发展，古老的神祇渐渐被人遗忘，而以手枪、毒品、娱乐为代表的新神迅速崛起。后者无所不用其极想将旧神驱逐，而奥丁作为旧神的代表则四处寻找伙伴，对抗新神的欺凌。繁华时代，神与神的战争拉开序幕……That morning, they agreed to gather in the square at the gate of the Bureau of Letters and Visits, but before the gathering was completed, someone appeared and asked to check their certificates and mobile phone information. Once they were confirmed to be defenders, they were taken to the bus.