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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.正说着，旁边军士又是一惊：那是……倭寇还是自己人？众人望去，城东北侧，几十骑正快速奔来，一明显比旁人高大许多的身影奔在最前。(2) Be able to skillfully use tools such as program operation flow and debugging;The disadvantage of state mode is that many state classes will be defined in the system. Writing 20 state classes is a boring job, and many objects will be added to the system. In addition, because the logic is scattered in the state class, although unpopular conditional branch statements are avoided, it also causes the problem of logic dispersion, and the logic of the entire state machine cannot be seen in one place.石志康（陈庭威）适逢其会﹐得见两大高手蒋真（高雄）与聂万龙（秦沛）对赌﹐因而对赌产生兴趣。 真虽战胜龙﹐却反被龙冤枉出千﹐含冤而死。 一日﹐一青年蒋百祺（吕颂贤）光顾赌场﹐大胜一帮印尼老千。 原来祺乃真之子﹐想藉此吸引龙之注意﹐趁机接近龙为父报仇。 其后康得赌痴 的赌术﹐技术大进﹐祺遂说服康合资经营另一赌场。 为此龙之赌场生意大受打击﹐故龙为保王者之名﹐不惜放火烧赌场﹐祺不幸葬身火海﹐康悲愤不已﹐……开价，自然要在这二者之间。讲述七月与安生是如此不同的女孩，安生桀骜，七月轻柔。从高中第一次见面开始，二人就成为最好的朋友。她们共同的梦想是成为演员。虽然演员的路并不好走，但姐妹俩一路扶持，克服困难，最终大放异彩。命运般的，她们爱上了同一个男孩家明。但相较爱情，两人更珍惜彼此的友情。