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Using the concept of Boolean functions and combinatorics theory comprehensively, we investigate the construction on annihilators of Boolean functions and the algebraic immunity of symmetric Boolean functions in cryptography:Firstly, we introduce two methods of constructing the annihilators of Boolean functions, Construction I makes annihilators based on the minor term expression of Boolean function, meanwhile we get a way to judge whether a Boolean function has low degree annihilators by feature matrix. In Construction II, we use the subfunctions to construct annihilators, we also apply Construction II to LILI-128 and Toyocrypt, and the attacking complexity is reduced greatly. We study the algebraic immunitiy of (5,1,3,12) rotation symmetric staturated best functions and a type of constructed functions, then we prove that a new class of functions are invariants of algebraic attacks, and this property is generalized in the end.Secondly, we present a construction on symmetric annihilators of symmetric Boolean functions.

本文主要利用布尔函数的相关概念并结合组合论的相关知识，对密码学中布尔函数的零化子构造问题以及对称布尔函数代数免疫性进行了研究，主要包括以下两方面的内容：首先，给出两种布尔函数零化子的构造方法，构造Ⅰ利用布尔函数的小项表示构造零化子，得到求布尔函数f代数次数≤d的零化子的算法，同时得到通过布尔函数的特征矩阵判断零化子的存在性：构造Ⅱ利用布尔函数退化后的子函数构造零化子，将此构造方法应用于LILI-128，Toyocrypt等流密码体制中，使得攻击的复杂度大大降低；通过研究(5，1，3，12)旋转对称饱和最优函数的代数免疫和一类构造函数的代数免疫，证明了一类函数为代数攻击不变量，并对此性质作了进一步推广。

Outside the entrance to the cinema, a middle-aged man and an elderly woman paced up and down selling copies of Socialist Action for a dollar. The September issue included articles about capitalism's contradictions, class war in Bolivia, and a commentary by Mumia Abu-Jamal—a regular feature.

在电影院入口处外面，一个中年男人和一个老年女人来回踱步，一美元一份向人们兜售那叠社会主义行动期号（那是九月号，里面的文章包括了资本主义的矛盾，玻利维亚的阶级斗争和作为其一贯特色的Mumia Abu-Jamal评论

It would, moreover, fly in the face of the fact that, in the current sense of the word, there are and have been paradigmatic metaphysicians who deny that there are first causes—this denial is certainly a metaphysical thesis in the current sense—, others who insist that everything changes (Heraclitus and any modern philosopher who is both a materialist and a nominalist), and others still who deny that there is a special class of objects that do not change.

而且，也会面对，在当前这个语词的意思看，有也已经有形上学家拒绝存在诸第一因——这个拒绝在当前意思里确实是一个形上学主张——，其他有些人坚持任何东西都在变化（Heraclitus和现代的物质主义者、唯名论者），还有一些人（Parmenides 和 Zeno）仍然拒绝存在不变客体的专门的类。

Since a non-nullable value type can never be set to a null reference, when a class member of such a type is mapped to an XML element declaration, the

由于永远不能将不可为空值类型设置为空引用，因此，在将此种类型的类成员映射到XML元素声明时

It gets harder still when the only way CS will take an accusation seriously is if the woman making the accusation produces a police report, which makes many false, Western, ethnocentric assumptions including that the rule of law in every country is applied equally regardless of sex, nationality, sexual orientation, ethnicity, class, etc.; the behavior is classified as a crime in every country and the victim would not be deemed guilty (eg, homosexual encounters or drug-related incidents); the police are reliable and a written report can be obtained in a timely manner without excessive effort or expense; and one is culturally and linguistically competent and knowledgeable of a country's crime reporting procedures or can easily find out what they are.

它更难获得的唯一办法时，政务司司长将采取指控严重的是，如果妇女提出指控产生警方报告，这使得许多虚假的，西方的，种族优越感的假设，包括法治，在每个国家都同样适用，不论其性别，国籍，性取向，种族，阶级等；的行为列为犯罪在每个国家和受害者将不被视为犯罪（例如，同性恋遇到或毒品有关的事件），警方是可靠和书面报告可及时没有过多的努力或牺牲，一个是文化和语言能力和知识的一个国家的报案程序，或可以很容易地发现它们是什麼。

Domestic large enterprises have built a first-class Technology Center is a national model CAD application engineering units, equipped with scientific and technical information, standards, structure, hydraulic, transmission, electrical and many other professional researchers, with senior professional titles 33 personnel, intermediate professional 404 titles of staff and a number of national patent technology, QY300, QY130H truck crane, QUY200 crawler crane on behalf of the domestic large-tonnage mobile crane the most cutting-edge technology research and development capacity and production levels, filled a number of national mobile crane technology gaps ; have a plate pre-processing, CNC plasma cutting, pentahedral processing center, the Russian landing boring, welding robot and so on more than 2000 sets of equipment, excellent manufacturing processing capacity, improve, reaching the advanced international level; has passed ISO9000 Quality Certification Center of China Quality system certification, access to American FMRC Company Registration Certificate of ISO9001, the leading product of three varieties of four won the national silver, truck crane for 15 years, was named the "National Customer Satisfaction Product", in which truck crane QY16 was the "National Consumer Trustworthy Gold China-made cars,"with the industry's only"°"products.

建有国内大型企业一流的技术中心，是国家CAD应用工程示范单位，设有科技信息、标准、结构、液压、传动、电气等多项专业研究，拥有高级专业技术职称人员33名、中级专业技术职称人员404名及多项国家专利技术，QY300、QY130H汽车起重机、QUY200履带吊代表了国内大吨位移动式起重机最前沿的技术研发能力和生产制造水平，填补了国家移动式起重机多项技术空白；拥有板材预处理、数控等离子切割、五面体加工中心、俄罗斯落地镗、焊接机器人等2000多台套设备，制造加工能力优良、完善，达到国际先进水平；已通过中国质量认证中心ISO9000质量体系认证，获得美国FMRC公司ISO9001注册资格证书，主导产品三个品种四次荣获国家银质奖，汽车起重机连续15年被评为"全国用户满意产品"，其中QY16汽车起重机获"全国消费者信得过国产车金奖"，为同行业唯一"金榜题名"产品。

XEX ~ Arg min{FIy E ~2} where the upper level is about topological structure optimization(a~ is a topological structure varable), and the lower level is a constrained programming about continuous variable y. 2 Apply graph, the action of permutation group on a graph, equiva- lent class, orbit etc.

取得的主要成果有： 1 依点到集的映射、集值映射、二元映射和分离定理等理论首次建立了具有拓扑结构双层规划的数学模型 min F s.t.x∈X y∈Arg min｛F|y∈Ω｝其上层规划为关于离散变量x的拓扑结构优化，下层规划是关于连续变量的约束规划。

A value of the Wiener index for a class of linear phenylene molecular graphhM is calculated, and a linear recursive formulas is obtained, and then a exact expressions is gained by solving some difference equations of the recursions.

给出了一类一般线性聚亚苯基图hM的Wiener拓扑指标的递推公式，通过求解差分方程而得到了它的Wiener拓扑指标的精确表达式。

The group shows Alibaba, company of this investment management will be dedicated invest at 2 class market, its held water to enhance Alibaba not only the group is in the actual strength that money endowment manages, and strengthened a group to be opposite of macroscopical environment understand thoroughly force, the fluidity management that strengthens group cash reserve in a bank, short-term investment management and capital risk manage, round to the Babaji in A cash is flowed into, pour out of and put a quantity to undertake making overall plans, on the foundation that assures fluidity, those who achieve cash beneficial result is the biggest change.

阿里巴巴集团表示，该投资管理公司将专注于二级市场投资，其成立不仅增强了阿里巴巴集团在财资管理的实力，而且加强了集团对宏观环境的洞悉力，加强集团现金的流动性管理、短期投资管理和资金风险管理，并对阿里巴巴集团的现金流入、流出以及存量进行统筹规划，在保证流动性的基础上，实现现金效益的最大化。

Group respect expresses Alibaba, company of this investment management will be dedicated invest at 2 class market, its held water to enhance Alibaba not only group assets manages actual strength, and strengthened a group to be opposite of macroscopical environment understand thoroughly force, strengthen management of liquidity of group cash reserve in a bank, short-term investment management and capital risk management, round to the Babaji in A cash is flowed into, pour out of and put a quantity to undertake making overall plans, in assure fluidity foundation to go up, implementation cash benefit is the greatest change.

阿里巴巴集团方面表示，该投资管理公司将专注于二级市场投资，其成立不仅增强了阿里巴巴集团资产管理实力，而且加强了集团对宏观环境的洞悉力，加强集团现金流动性管理、短期投资管理和资金风险管理，并对阿里巴巴集团现金流入、流出以及存量进行统筹规划，在保证流动性基础上，实现现金效益最大化。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。