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In this example of abstract factory, there are two specific tables (user and dept) and two processing methods (SQL and access). According to the processing method, it is divided into two factories. Each factory has two abstract table processing, and each table processing is an abstract.The reason is, first, its durability needs to be repaired by 800 ~ ~ ~, which can fully meet our needs.三年未到，就成就地仙之位。隐忍是暂时的，只因西班牙在美洲西岸的军事部署有限。Because some denial of service attacks take advantage of the vulnerabilities of network protocols, others seize the limited processing capacity of the network or equipment, the prevention and treatment of denial of service attacks has become a headache for administrators. In particular, firewalls, load balancing and other equipment, which are widely used on the backbone lines in most network environments, often become the bottleneck of the whole network when DDoS attacks occur, causing the paralysis of the whole network.(2) Graduates with bachelor's degree or above: They are required to have a good foundation in English listening and speaking and pass the National English Test Band 4 or Band 6 (with a score of 425 or above).