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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.但局势演变到今日，首先氛围上就不允许，其次如果现在这么搞，就相当于逼所有以海为生的人造反。二十一世纪初，中国的宇宙飞船发射成功后，境外的间谍组织把目标锁定在我国著名航天专家、航天研究所所长陈冬生的身上……某日夜，在海迪娜国某处一个静谧的场所，一名境外间谍和一位神秘的女士在谈着一笔交易……按九门解家家规，解家人六十岁生辰那日便是金盆洗手之时。解家老仆庖丁叔六十大寿当天死于非命且死状惨烈。解九爷与受佛爷所托、前来解家贺寿的张副官一同开始追查命案线索，却发现这宗谋杀案的源头要追溯到几年之前。 紧接着，解府仆人以及与谢家有关联的老人接连不断死去，且死亡现场都出现了“虎骨梅花”符印。一个深埋多年的秘密即将被层层揭开… …3. Some types, such as the core trading engine of the exchange, control the trading process. If multiple types can be created, the system will be completely chaotic. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process. The following is an analysis of some examples that we need to pay attention to when applying singleton pattern in the development process.罗伯特打算在接下最后一份价值200万的合约后洗手不干，他的任务是去杀死一个专门窃取机密的电脑盗贼并取回一份磁碟。而贝米高也同样接受了这一任务。双方在酒店展开了一场竞争。罗伯特抓住了电脑窃贼伊莉，拿到了磁碟。而贝米高则杀死了前来购买磁碟的国际刑警，并进而追踪到伊莉的寓所。杨梅被从2466年穿越而来的梅氏子孙梅海波告知，通过认祖归宗可改变梅家未来十八代连续倒霉的命运，遂与外婆兰姥姥利用海波留下的召唤石召唤帮手，却阴错阳差召唤出小说鹿鼎记里的韦小宝。