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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。

Because this produces peculiar tooth jaw face to misshape, constant expression is mid development undesirable reach cave, length of direction of around of bone of the upper jaw and perpendicular direction height shorten, tooth bend is narrow, the tooth lists jam, occlusive relation is disorder, anterior teeth or complete tooth bend are enclothed instead, before mandible true sex or false sex dash forward. 2 use DO method at the back of art of Jiao Zhi cleft palate in the portion caves at the back of art of abnormal cleft palate in the portion caves abnormal treatment method is very much, if Kettle reports block is mental,raise fight a way, the face guard method that Tind Lund uses, wang Ketao [1] uses Peng body to get together 4 fluorine ethylene fills up repair misshapes this kind etc.

因此产生特有的牙颌面畸形，常表现为面中部发育不良及凹陷，上颌骨前后方向长度及垂直方向高度变短，牙弓狭窄，牙列拥挤，咬合关系紊乱，前牙或全牙弓反覆盖，下颌真性或假性前突。2利用DO术矫治腭裂术后面中份凹陷畸形腭裂术后面中份凹陷畸形治疗方法很多，如Kettle报道枕颏支抗法，Tind lund采用的面罩法，王克涛[1]采用膨体聚四氟乙烯充填修复此类畸形等。

I always think life is the mot important thing in my heart, all things get their own way.

我觉得生命是最重要的，所以在我心里，没有事情是解决不了的。

Be especially in the field of civil case in Guangdong , rural area "carry out area difficult to get rich muchly ",the legal documents having the part suitable to go into effect has had no way to be carried out , has blocked the harmonious sustainable development that rural economy builds gravely.

在广东，农村是"执行难"的多发区，特别是在民事案件方面，有相当部分生效的法律文书无法得到执行，严重阻碍了农村经济建设的和谐可持续发展。

I had no luck finding such a way to get that in the managed world.

我没有运气找到这样一种方式来获得，在管理世界。

The provision of article 6 in Interpretation is not conducive to the protection of the interests of the victim. To a certain extent, it increases the burden of safety-ensuring obligator. In the third part, the author makes a reconstruction of liability of violating safety-ensuring obligation in order to get a more reasonable way of accountability.

目前《解释》第六条中关于违反安全保障义务的责任规定过于简单，不利于保护受害人的利益，同时又在一定程度上加大了安全保障义务人的负担，因此在第三章中对违法安全保障义务的侵权责任加以重构，以期得到一个更为合理的责任承担方式。

He was eager to get out of the common and distinguish himself in some way.

他渴望出人头地，在某方面与众不同。

Any outlandish sort of exercise seems the perfect way for you to get in shape.

任何怪异的运动都是你塑身的妙招。

In this way I can get rid of the bad habit of postponement.

这样我就能够革除拖延的坏习惯了。

They approach questions and problems relating performance phenomena in the practical/pragmatical way that they are asked and formulated by managers for example, where to compete and how to compete to get competitive advantage?

他们以一种实践/实用主义的方式研究与业绩现象有关的疑问和问题，在这种方式中这些问题是由经理人问出来和阐述的（例如，在哪里竞争和怎样竞争以获得竞争优势？

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。