上交换的

It is proved that a semiring is complemented if and only if it is a direct product of some Boolean algebra and Boolean ring by studying the relations of congruences on the complemented semiring, so the complemented semiring is the commutative semiring.

s-内射模。通过研究可补半环S的性质及S上的同余关系，证明出可补半环与布尔环和布尔代数的直积是等价的，因而可补半环是交换半环。

Based on switching network,the technology of Virtual Local Area Network is applied to construct a logical network which spans different subnet.It can avoid the network broadcast storm in order to improve the performance,security and expansion of whole campus network.

VLAN是在交换网络的基础上构建可跨越不同网段、不同网络的端到端的逻辑网络，可避免校园网广播风暴的出现，以提高整个校园网的安全性和可扩展性。

"I am sick of this useless butchery of young Americans, and in exchange of these four days of weather favorable to combat, I will provide you enough Boches to keep your accountants occupied with months of work."

我再也不能忍受这些美国年轻人遭受无意义的屠杀，我会送给你足够的德国鬼子保证让你在天国的会计师们忙上整个月来交换这4天适合作战的好天气的。

In the model of pure exchange economy of not complete real assets market, those who proved to be put in the product space of initiative hold space and capital structure space is dense open market, collect leaves to go up in this, bogus drafts balanced part is solid some flows glossily form.

在不完全的实在资产市场的纯交换经济模型中，证明了存在初始持有空间和资产结构空间的乘积空间的稠密开集，在这个开集上，伪拟均衡集是固有的光滑流形。

Let n ≥ 4 be a fixed integer, R be a unital commutative ring of characteristic not 2, and D_n be a D_n-type classical Lie algebra over R.

假设n是一个大于等于4的整数，R是特征非2的有单位元的交换环，D_n是环R上的D_n型李代数，N是D_n的一个极大幂零子代数。

Three Texas drovers met on the highway and proceeded to dicker as follows: Says Hank to Jim:"I'll give you six pigs for a hoss; then you'll have twice as many critters in your drove as I will have in mine."

得克萨斯州的三个贩子在公路上碰头，打算进行下述的物物交换。汉克对吉姆说："我用6 头猪换你1 匹马，那么你的牲口数将是我所有牲口数的2 倍。"

Because of the nature of non-exchanging, the matrixon the division ring no longer possesses the usual Jordan canonical form, and themethods of partitioning, decomposition of the matrix appears to be particularlyimportant to our discussion.

因除环的非交换性，一般除环上的矩阵已不再具有通常的若当标准形，因此矩阵分块，分解手段对我们的讨论显得尤为重要。

In this paper, firstly, a detail analysis、 study and discussion of the existing disposing-chlorine method were made, on this condition, a new method based on the way of oxidation and deoxidization was discussed, phosphoramidic acid chelate resin and DOOl cation exchange resin were chosen as framework materials, two kinds of new disposing-chlorine materials could be obtained by loading Fe~(2+) on the skeleton of the materials, the surplus residual chlorine was disposed by taking advantage of chlorine oxidizing Fe~(2+).

本文在对已有的余氯去除方法进行分析、研究、探讨的基础上，提出一种基于氧化还原方式的吸附除氯方法，实验以氨基磷酸螯合树脂和D001强酸性阳离子交换树脂为骨架材料，并对这两种材料载Fe~(2+)改性得到两种新型除氯剂，通过固载的Fe~(2+)与水中余氯(Cl_2、ClO~-、HClO)的氧化还原作用将水中的余氯除去。

Based on the analysis of the geometrical significance of basic elementary matrix es,the authors put forward some suggestions of teaching of matrixes and transformations in Senior School New mathematics curriculum.

表示"交换某两行的位置"、"把某一行乘以一个非零数"、"把某一行的k倍加到另一行上"的3种基本初等变换的矩阵分别称为基本初等矩阵(1)、(2)、(3)。

English Summary/英文概要: The dangerous game a 12-year-old boy plays with a serial killer.Steven Lamb digs holes on Exmoor. Every day after school and at weekends, sweating in the sun and shivering in the damp sea mists. Steven has a purpose…While his classmates swap football stickers, Steven digs to lay to rest the ghost that haunts his family.

每天放学后以及周末，无论是顶着大太阳还是潮湿的雾气，史蒂文·兰姆在埃克斯穆尔高地上不断挖洞，当他的同学们都在忙着交换足球贴纸的时候，史蒂文却有着一个目标，就是将纠缠他们一家的那个那个幽灵埋葬。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。