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CMD (Common Module Definition), in which a module is a file.In the process of DNS resolution, the client initiates a query request, and the DNS server may need to make additional queries to complete the resolution process and give a response, which will consume certain computing and network resources. If an attacker uses a large number of controlled hosts to continuously send resolution requests for different domain names, the cache of the DNS server will be continuously refreshed, and the failure of a large number of resolution requests to hit the cache will cause the DNS server to consume additional resources for iterative queries, which will greatly increase the resource consumption of the DNS server.Let's look at the above picture first. It is three short video apps. It can be seen that although the content types are the same and the product forms are similar, the different contents displayed will give users different feelings.　　1840年，一个风雨交加的夜晚，泉州知府萧玉堂夫妇中年得子，不料生下一个肉团。萧夫人惊骇而亡，萧玉堂悲愤交加，命仆人将这一肉团丢弃。一药翁飘然而至剖开胞衣，一声惊天动地的啼哭，虚云就这样来到了人间，由此开始了他长达一百二十年，经历四十八奇的求道旅程。For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.略微的停顿之后，转而问道：对了，你哥哥那边有消息吗？范依兰嫣然笑道：哥哥那边一切安好，时常前往草原，是楼烦王和常客，匈奴单于也对哥哥礼敬有佳。8. Easy to share