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The authors study the property of the active power/angle sub-matrix in power flow Jacobian matrix and the sufficient condition for the invertibility of the sub-matrix as well as the necessary condition for singularity are given.

探讨了潮流雅可比矩阵中有功/相角子矩阵的性质，给出了该矩阵可逆的充分条件及其奇异的必要条件。

In recent years, as a new sport and with the initial stages of national sport industrialization which is a relative good environment for developing sports, beach volleyball do has some development, but it still leaves much to be desired even without negative impact of old sport management system.Through investigating of present condition of national beach volleyball tour, tournament and invitatory matches we have an initial understand of the management of current condition of national beach volleyball matches.

我国最初是在1989年的七月开始接触沙滩排球运动的，近几年来我国沙滩排球虽从无到有有了一定的发展，但作为一项新兴的运动，而且又处在我国体育产业化的初期，在没有旧模式的限制下应该具有很强的活力，但事实却并非如此。

In chapter four, we study the second isoperimetric connectivity of line graphs and line digraphs. For line digraphs, we show that the second isoperimetric connectivity of strongly connected line digraphs with δ≥ 2 equals its connectivity. For line graphs, we give a sufficient and necessary condition for the existence of the second isoperimetric connectivity, and we show that under the condition that the second isoperimetric connectivity exists, the second isoperimetric con

第四章研究线图和有向线图的第二等周点连通度，得到了如下结果：(1)最小度大于等于2的强连通有向线图的第二等周点连通度等于它的点连通度；(2)对于无向线图，我们给出了第二等周点连通度存在的充要条件；(3)对于第二等周点连通度存在的无向线图，它的第二等周点连通度或者等于限制点连通度或者等于最小度和次最小度的和。

In Chapter 5, we investigate the linear systems involving Kronecker product. We analyze its condition numbers and the level-2 condition numbers.

在第五章我们考察了带Kronecker积的线性系统，得到了与经典结果类似的条件数，并讨论了其二层条件数。

Results Candida albicans growth was slow and no hyphae but yeast could be found under anaerobic condition.No difference of growth rate in lag phase of Candida albicans under different pH value condition was found.

方法通过调节Muller-Hinton液体培养基的pH值和去除培养基中的氧气来观察白念珠菌的生长曲线，倍增时间和菌丝形成率的变化。

Contract for to conduct the current law system lawmaking present condition, our country to contract for the current the system analysis and our system for this text three investigated the our country completely in the juridical blemish the system present condition to combine to put forward on this foundation perfect our system: While is collective representative- collective economys organization of the landholding power corpus of explicit assurance.

为此本文从我国农村土地承包经营权法律制度立法现状、我国现行的农村土地承包经营权制度的法律分析以及我国现行的农村土地承包经营权制度在法律上的缺陷三个方面全面考察了我国农村土地承包经营权法律制度现状并在此基础上提出了完善我国农村土地承包经营权制度的基本思路：一是明确确定集体土地所有权主体的代表——集体经济组织。

Filter paper and lindane can be degraded effectively by the complex microbial system during pH 7~9 which also was the optimum condition of cellulose degrading, and in the condition of pH 10, lindane was degraded 49.62%, much more than that of cellulose.

在纤维素降解最佳的pH值7～9范围内，也同样有利于林丹的降解，而在纤维素降解较少的pH值为10的条件下，林丹的降解率高达49.6％。

Filter paper and lindane can be degraded effectively by the complex microbial system during pH 7～9 which also was the optimum condition of cellulose degrading, and in the condition of pH 10, the degradation ratio of lindane reached 49.62%, much more than that of cellulose.

在纤维素降解最佳的pH值7～9范围内，也同样有利于林丹的降解，而在纤维素降解较少的pH值为10的条件下，林丹的降解率仍高达49.6%。

In the paper, with the characteristics of the line integral road, free surface condition and continuity condition, we gave the additional equations to close the equation group and overcame the difficulty, and successfully calculated and analysed the nonlinear ship wavemaking by the method.

文中根据自由面线积分路径的特点，自由面边界条件以及连续性条件来建立补充方程，而成功地解决这一难题，从而为非线性船波分析提供了一个有力的工具，并利用此方法分析非线性兴波取得了成功。

In the second chapter,we study the convergence of two points Secant method and single point Secant method under the condition of the radius Lipschitz condition with the L average.

在第二章中，我们研究了两点弦截法和单点弦截法在关于L平均的弱Lipschtiz条件下的收敛性。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。