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这直白的话语，立时让老鳖等人觉得无比亲切，都笑着答应了。8. Distribute the core material package and purchase the ingredients with higher price elasticity nearby. It not only ensures the unity of tastes, but also reduces the cost of food materials. According to the evaluation of famous consulting organizations, the cost ratio of one-yuan small hotpot brand is at least 27% lower than that of other brands.Part of the reason why we are unhappy is that we are not sincere enough. It is not easy to dare to love and hate. It takes courage to embrace you across the crowd and to tear your face regardless.From the above command class code, we can see that any operation has an execute method to perform the operation. The above code uses traditional object-oriented programming to implement the command mode. The procedural request call of the command mode is encapsulated in the execute method of the command object. Have we found the above writing code a little cumbersome? We can do this using the callback functions in javascript, In object-oriented, The receiver of the command mode is saved as an attribute of the command object, and the command execution operation is agreed to call the command.execute method. However, if we use the callback function, then the receiver is closed in the environment where the callback function is generated, and the execution operation will be simpler. Only the callback function can be executed. Let's look at the following code: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.转头一齐望向青冥碧海中的那轮半月，亲密中更多了一份相知、一份坦然。