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4. Please pay attention to the sequence of question numbers when answering questions. The answer can only be written within the scope of the question area of the answer card. Otherwise, the answer is invalid. Any answer written on the test paper or draft paper is invalid.1935年春，一批红军女兵在强渡嘉陵江后与主力失散，误打误撞闯进了羊坝头地区战场。羊坝头的一场恶战，把失散的女子独立团尖刀班的女兵战士们和红军主力派来的护士班女兵们聚到了一起。为了减少不必要的伤亡，接到红军作战某部的杨团长命令，尖刀班和护士班一起护送伤员，北上寻找红军主力部队。从此一群年轻的女兵们将独自面对险恶环境、狡诈的敌人，开始了一段可歌可泣的长征！一路上，女兵们烧粮仓炸军火、偷电台杀山匪、翻雪山过沼泽，八百里风食露宿，以战养战周旋于敌匪之间。同甘共苦、生死与共，完成了一项项几乎不可能完成的任务！。有血与泪的生死离别，更有缠绵悱恻的爱情；有时不共戴天的仇家，也有不离不弃的亲情，一朵朵铿锵玫瑰在炮火中绽放，又如落樱般在纷飞中凋亡。作为战士，她们谱写了一曲宏伟壮烈的英雄赞歌；作为女兵，她们吟唱了一首婉约凄美的战地情歌……DDOS attacks mainly occur in the network layer. Its most obvious characteristic is to send a large number of attack packets, consume network bandwidth resources and affect normal users' access. At present, the detection and defense technology for DDOS attacks in the network layer is quite mature, and at the same time, some new attack methods-DDOS attacks in the application layer have emerged. Different from network layer DDOS attacks, application layer DDOS attacks mostly imitate the access behavior of legitimate users and will not generate a large number of attack data packets during data transmission, but they will consume server resources through a large number of database queries and other operations, which is more difficult to detect. According to the different attack modes, DDOS attacks include reflection amplification attacks in addition to ordinary flooding attacks. This type of attack often uses a legitimate server as a reflector, which sends a large number of data packets to the target, thus causing greater harm. At present, DDOS attacks against DNS servers are also common. Attackers often send fake domain names to DNS servers, consuming DNS server resources. At the same time, due to the recursive query mechanism in DNS servers, DDOS attacks against DNS servers have a large impact range.After understanding the history and classification of design patterns, how should we learn design patterns? Before learning the design pattern, readers must establish a kind of consciousness, that is, the design pattern is not only a method and technology, but also an idea and a methodology. It has nothing to do with the specific language. The main purpose of learning design patterns is to establish object-oriented ideas, program to the interface as much as possible, with low coupling and high cohesion, so that the programs you design can be reused as much as possible. "Specious. Learning design patterns can better understand object-oriented ideas. Design patterns are some design skills and tricks. Don't rise to ideas and methodologies, okay?"该剧讲述了拥有13岁年龄差却同甲的18岁青年与31岁青梅竹马之间的爱情故事。Power supply unit3. In complying with the provisions of Section I of this Chapter, each ship shall give full consideration to the environment and conditions of poor visibility at that time.