环

In this paper,the branch pipe network as a virtual ring pipe network is proposed,and the equation for it has been set up.It is proved that Kirchhoff law of ring pipe network is a kind of special form of equation,which is the virtual ring pipe network.

本文中提出将树枝管网视为虚环，建立了虚环方程，证明了环形管网的基尔霍夫定律是虚环方程的一种特殊形式，环形管网方程和虚环方程互相兼容，可联立求解。

About the semiprime Noetherian rings and left FBN rings, we obtainTheorem 1.2.6 Let R be a semiprime Noetherian ring in which every prime ideal has the left AR property.

关于半素Noetherian环和左FBN环的测试集我们有定理1.2.6：设R是半素Noetherian环且每个素理想都有AR性质，设S={P∈S：P是R的素左理想且当P是一个双边理想时，R_P不是一个除环。则S是一个内射测试集。

In addition, we obtain the following results:(1) A ring R is weakly unit-regular if and only if so is the n×n matrix ring Mn of R for any n≥1;(2) Let R be a ring such that R/J is regular.

另外，我们还证明了下面两个结果：(1)环R是弱幺正则的当且仅当Mn(n≥1)是弱幺正则环；(2)假设R是一个环且使得R/J是正则环。

The following statements are proved:. A is equivalent to a diagonal matrix if and only if A is similar to a diagonal matrix.. If R is an APT ring, then A can be uniquely diagonalized as diag{e1,..., en} and ei divides ei+1.. R is an APT ring if and only if R/I is an APT ring, where I is a nilpotent ideal of R.

本文证明了以下结果：A相抵于一对角阵当且仅当A相似于一对角阵；若R是一APT环，则A在相似变换之下可唯一地化为对角形diag{e1，…，en｝，这里ei整除ei+1；R是APT环当且仅当R/I是APT环，这里I是环R的一幂零理想。

The standard target for the rifle and pistol consists of ten circular scoring zones, ranging from one point in the outer zones to ten points in the bull.

步枪和手抢的标准靶由10个靶环构成，排列是从1环到10环。最外面的靶环为1分，靶心为10分。

PECH based PUs showed higher phase separation than that of PPG base PUs owing to that the -Cl groups in PECH reduced the flexibility of molecule chain and hindered the formation of hydrogen bonds between ether groups in soft segments and -NH groups in hard segments. As a result, PECH based PUs have lower free volume content, diffusion coefficient and equilibrium adsorption of CO〓, benzene and ethanol through them than through PPG based PUs.

聚环氧氯丙烷醚聚氨酯的氯基降低了链段柔性，妨碍了软段中醚基与硬段中氨基的氢键作用，导致其相分离程度较聚环氧丙烷醚聚氨酯大，并使CO〓、苯和乙醇蒸汽在聚环氧氯丙烷醚聚氨酯中的渗透系数和扩散系数较聚环氧丙烷醚聚氨酯小，而偏离费克扩散的程度大。

The natural epoxy wax is the one or two wax within which the fatty acid and phytol chain that has one epoxide group at least naturally, while the wax made artificially is the one that has one or two fatty acid and phytol chain transformed artificially to introduce in one epoxide group at least.

天然环氧蜡为其中的该脂肪酸和醇链中的一个或两个天然地包含至少一个环氧基团的蜡。人工环氧蜡为其中的该脂肪酸和醇链中的一个或两个已人工改变以引入至少一个环氧基团。

According to the results of stress calculation, provided the choosing basis for structure parameters of hydraulic cylinder and advanced a new cylinder bottom structure-oblique plane check ring concave groove.

对 10MN闭模挤压液压机卡环式液压缸进行有限元应力分析，根据分析结果，给出了液压缸缸底结构参数的选取依据，并在此基础上提出了一种斜面卡环凹槽新结构，有效解决了大型卡环式液压缸卡环凹槽的应力集中问

Ask to satisfy a client and admit need here, the member that decide to be engaged in an environment affecting pricer at drafting invite applications for a job 2009 here counts a name, specific requirement is as follows: One, object of invite applications for a job and condition Apply for personnel to need to annulus judges engineer card or annulus to review mount guard evidence, major is the environmental project, personnel that is engaged in annulus evaluate work making now first consideration.

为满足客户要求和我处发展需要，我处决定于2009年拟招聘从事环境影响评价的人员数名，具体要求如下：一、招聘对象及条件应聘人员需有环评工程师证或环评上岗证，专业为环境工程、现从事环评工作的人员优先考虑。二、应聘人员注意事宜： 1、引进人员相关待遇参考省内环评专业科研院所，人员为长期聘用制，签订聘用合同。

It is shown that let R be right nonsingular AGP-injective rings, if R be right CF rings and every right principal ideal is two-side ideal, then R is Von Neumann regular ring.

证明了设R是右非奇异右AGP-内射环，如果R是右CF-环且每个主右理想都是双边理想，则R是正则环，其次，讨论了右AGP-内射环的非奇异性。

Shop assistant: Please check at the door.

店员：请您到门口柜台交费。

In the end, transportation of PAHs in the environmental matrix was preliminarily investigated and discussed according to PAHs data of soils and sediments from a certain region in Shanghai. The result indicated that there are two or more pathways on PAHs transportation in the environmental matrix.

最后，对上海特定地区内PAHs在环境介质中的迁移径途进行了分析讨论，结果表明上海市土壤和沉积物等环境介质中PAHs的迁移存在多种途径。