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In this paper, we mainly study the alternating group A_4 actions on spin 4-manifolds. First we discuss the special action of A_4 on K3 surfaces of Fermat type, we compute the fixed points set of this action and some invariants of the group action, also we get some topological properties. Then we study the A_4 actions on general K3 surfaces and obtain some similar results.

本文主要是以交错群A_4在K3曲面上的作用为研究对象，从Fermat型K3曲面上的特殊的A_4作用出发，得到了Fermat型K3曲面上A_4作用的不动点，利用不动点集计算了群作用的一些不变量并得到了相关的拓扑性质，在此基础上进一步把其中的一些结果推广到一般情形下的同伦K3曲面上。

The truth is, that we may as well speak of many designs as of one; nor need anything be excluded from the plan of a great work to which the mind is naturally led by the association of ideas, and which does not interfere with the general purpose.

事实上，我们都有可能像任何思想家一样谈出很多构想，而且不需要经历从投入巨大精力制定纲要到进行与智慧相关的长期沉思的求证过程去证明这个构想，更不会关心这个构想有没有普遍的效用。

Attack and its defends to be two sides that closely related with of network security , further investigate , attack theory and technology can protect network security of information system effectively.

攻击和防御是网络安全的两个密切相关的侧面，不深入研究攻击理论和技术就不能有效地保护网络信息系统的安全。

I 2002.5.2 menopause, pregnancy was confirmed, and by the book, said the projected day, and now I have ninth week of pregnancy, and the first two weeks I have reflected very strong recently seemed to reflect alleviate a lot of early pregnancy, I am worried that the baby goes not stop growing, because the family used mosquito coils, although the little time I have met, but I know that the impact of mosquito-repellent incense poor, In addition, the family wardrobe issued from time to time in the scent of camphor ball, so I can not stand, I do not know this is not a bad thing, there is no relevant information, please give me your answer to this doubt, very worried that this baby a negative, how can I do that?

椁脑对孕妇是否有影响？我在2002.5.2停经，经确认是怀孕了，按书上说的日子推算，现在我已经怀孕第九周了，前两周我反映很强烈，近来好像早孕反映减轻了很多，我担心肚里的孩子是不是停止生长了，因为家里使用过蚊香，尽管我接触的时间很少，但是我知道蚊香的影响不好，另外，家里衣柜里时常发出樟脑丸的气味，让我很受不了，我不知道这样是不是不好，没有相关的资料查询，请您给我解答这个疑惑，很担心这样对孩子不利，我该怎么办那？

When decisions are interdependent, indivisible, irreversible, and imperfectly foresighted, plans are more effective than decisions.

当决策是相关的、不可分割的、不可逆的以及不完全预见时，计划要比决策有效。

To pay attention, some girls buy the foreign trade clothes clothes, clothes look like fundamentally do not have the problem, but puts on the upper body to be able to discover, two side shoulders not equally high, sleeve not equally uneven, chest too width very sloppy, either Sleeve puts on for a morning to be able upwardly to hemstitch, these goods also all are the slight defect, this kind cannot see the slight defect at least needs to put on for several hours only then to be able to discover, but very many girls on-line buy clothes, either trial time too happy, only turns and look at the design and the color, looks for the end of a thread, either is busy is chopping the price, how doesn't have pays attention, And so on went home has put on a day discovery problem, also has been late, therefore everybody bought clothes time wanted careful to try oh!!

如了解该资讯相关课程或报读，请联系我们的课程顾问或网上留言◆如需要报读或了解更多的资讯，请点击"深圳专业英语培训网"关于选购衣服注意的是，有的女孩买外贸衣衣，衣服看起来根本没毛病，可是穿上身就会发现，两边肩不一样高，袖子不一样齐，胸口太宽很邋遢，或者衣摆穿一上午就会向上卷边，这些货也全都是瑕疵品，这种看不出的瑕疵至少要穿几个小时才会发现，但是很多女孩在网上买衣服呀，或者试的时候太高兴，只顾看款式和颜色，找找线头啦，或者忙着砍价，就没怎么注意，等回家穿了一天发现毛病，也晚了，所以大家买衣服的时候要仔细一点的试哦！！

Peasants who suffered unreasonable deprivation would allege even exaggerate irrationality of the treatment in order to endow legitimacy with his incompliance. And if this treatment had no validity, he may also threat prosecuting or finally indicting his antagonist ,this means will give him great courage in the game. The effect of this strategy also lies on the type of the antagonist. Whether he takes law as a weapon or not in the dispute is decided by cost calculation of this means.

另一方面，被不合理但合法剥夺的农民，会想尽办法先避开利益剥夺的合法性，之后宣称甚至夸大这种利益剥夺的不合理性，从而为自己的不顺从行为创造正当性，这种行动策略最常见于官民纠纷当中，因此它的效果就与基层干部的&摆平&能力相关；如果是不合理且不合法的利益剥夺，那么除了宣传、夸大不合理性外，他还会以诉讼相威胁或者诉讼的方式来维护自己的利益，将追求合理性与追求合法性两者统一起来，这种抗争策略的效果同样与抗争对象的层次有关。

There is no ethical reason to allow proprietary applications on the GNU system, but strategically it seems that disallowing them would do more to discourage use of the GNU system than to encourage development of free applications.

允许私有应用在GNU系统上运行没有与伦理相关的原因，但是从战略上看，不接受它们似乎是更多地阻碍使用GNU系统，而不是鼓励自由应用的开发。

The United Nations must have the power to propose and organize action without being hobbled by irrelevant issues.

联合国必须拥有不受不相关问题的掣肘而提出并主持行动的权利。

The expert point out that beautiful looks, late teach or don't grow, don't breast feed, pressure big, emotion repression, these keywords sames which get a female a correlation with white are also induct of breast carcinomases factor!

专家指出，美貌、晚育或不生育、不哺乳、压力大、情绪压抑，这些与白领女性相关的关键词同样也是乳腺癌的诱发因素！

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐