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Since the single mode is instantiated only once, the first call returns an instance object of a. When we continue to call, the instance of b is the instance of a, so aa is printed below.The Jinning case has a lot to do with the inaction of the local police. If the police had paid a little attention, so many people would not have died.听到陈启答应，吕文心顿时松了一口气。If an attacker sends SYN packets quickly with their own undisguised IP address, this is a so-called direct attack. This attack is very easy to implement because it does not involve spoofing or modifying packets below the user layer of the attacker's operating system. For example, he can simply send many TCP connection requests to implement this attack. However, for this attack to work, the attacker must also prevent his system from responding to SYN-ACK packets because of any ACK, RST, or ICMP (Internet? Control? Message? Protocol) will cause the server to skip the SYN-RECEIVED state (go to the next state) and remove the TCB (because the connection has been successfully established or recycled). Attackers can do this by setting firewall rules, causing the firewall to block all packets (except SYN) to reach the server, or causing the firewall to block all incoming packets so that SYN-ACK packets are discarded before reaching the local TCP handler.3. The entry points obtained in different competitions are also different. There are many feedback competitions and a large number of entry points in JJ Competition Hall. After obtaining the entry points, various items can be synthesized in the synthesis furnace.抗战时期上海名门明氏家庭三姐弟中，小弟明台是军统特工，代号“毒蝎”；大弟明楼表面是汪伪政府要员，又是军统特工，身份复杂；大姐明镜是红色资本家，秘密资助中共地下党。明台与生死搭档于曼丽在上海秘密活动，暗杀汪伪政府骨干，搜集日军情报。在“粉碎计划”行动中，明台与中共地下党“锄奸”小组成员程锦云联手，成功爆破了汪伪政府专列；又联手除掉汪伪高官汪芙蕖。两人在战斗中产生了感情，机缘巧合，两人又在家族安排的相亲上见面并订了亲。明台在一次次行动中渐渐对国民党的自私自利心灰意冷，程锦云发展他成为中共地下党，明台正式以双面间谍身份开展活动。在“丧钟敲响”行动中，于曼丽牺牲，明台历经折磨，最终用虚假情报成功迷惑了日军，为第二战区的胜利赢得了转机。最终，明氏兄弟联手除掉日本间谍。5) If the Local Connection icon in the Network Connection window prompts "Local Cable Unplugged", it indicates that one end of the network cable connector from the switch or HUB to the user network card is loose or there is a problem with the network cable, then check whether the network cable is in good contact, and if the contact is good, then check the network cable. Does "Local Connection Accepts Restriction or No Connection" appear in the taskbar with a yellow background (! ), has no effect on the Internet. If you don't feel pleasing to the eye, you can remove it! Method: Double-click the local connection icon-Properties-Remove the cross check before "Notify me when this connection accepts restrictions or there is no connection"-OK.