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Central focus metering: It is a traditional metering method, which pays attention to about 2/3 of the position in the center of the picture. The advantage of this metering method is that it is easier to control the effect.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.Breaking the "Paganini Miracle"//256三名大陆青年来港做“省港旗兵”，以为做完大买卖，即返乡下过好日子，误闯误撞之下在一个定婚宴会上，认识富商施头，而施头则被美女Lychee所戏弄，认为前进发与施头一样，杇木不可雕，施头扬言要报复，将前进发交给一名模特儿导师Anita训练，令发成为一出色之社交人才。Application software is a variety of programs that are user-oriented and written to solve practical problems. It can be written by users themselves or purchased. For example, we often use office software Office XP, drawing software Photoshop, game software Red Alert and so on.　　正当警方全力调查”章鱼“之际，毒贩山鸡、飞狐得到指令：”章鱼“进入警方视野，速灭！”章鱼“已死，根据线报，目标直指山鸡、飞狐，而二人也相继被杀！螳螂捕蝉，黄雀在后，几次事件，贩毒集团意识到内部存有卧底公安的事实，立即调查，几名卧底警察被杀，并公然弃尸向我警方示警！