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System.out.println ("execute the first opt! ");The world is very complicated, full of phenomena, facts and various viewpoints (insights, lies and deception). We need to extract the consistency behind them in order to quickly understand and understand the world. This consistency is the dimension in the classification. The classification of the three worlds is just to find a classification method for countries that we have not used before. The traditional classification of countries is based on geographical location (five continents), population (large and small countries) and development stage, while the three worlds are classified according to their relationship.ListenToACK reflection attack is a common reflection attack technique, Using TCP three-way handshake, When the source IP address of SYN is disguised as Target's IP and the transmitter try to establish TCP connection, the reflector's response will be directly forwarded to Target. In the process of attack, a large number of ACK responses responded by the reflector will be sent to Target by controlling a large number of controlled hosts to perform the clock operation, thus occupying Target's network bandwidth resources and causing denial of service.When setting up a network, the selected network cable must have flame resistance to reduce the probability of fire. Generally, the rubber outside the real network cable is flame-resistant, which is a national mandatory standard. However, fake network cables are often made of common flammable materials. When we buy network cables at ordinary times, we can also use this feature to identify the authenticity of network cables.以餐厅为背景,讲述了天才厨师崔正宇（张义秀饰）和LauraDining餐厅的主厨尹道建（李灿亨饰）之间发生的浪漫爱情故事。