置换

By means of chemical-displacement and orthogonal test method,the various technological parameters of the colorant for steel at normal temperature are determined.

文摘：运用化学置换法和正交试验法测定常温着色液的温度、酸度、成分、含量等参数及其对不同状态及成分的钢铁色膜质量的影响规律，研制出了一种性能优良的钢铁常温古铜色处理液及处理新工艺。

Hydrogen always has valence 1, so other elements' valences equal the number of hydrogen atoms they combine with.

元素的特征价数是以该元素一个原子可结合的氢原子数或可从一化合物中置换出的氢原子数来表示。

The percutaneous balloon mitral valvuloplasty was performed in the patient with single thickened tendinous cordae.The valvular closed commissurotomy was performed in the patient with thickened non-calcified tendinous cordae.The ATC stereoscopic images that revealed by dynamic 3-D reconstruction technique could be not acquired in two-dimensional image technique.

结果：本组瓣膜病患者，有两组腱索增粗并钙化者及腱索稀疏与断裂者均行瓣膜置换术，仅单组腱索增粗者行瓣膜球囊扩张术，两组腱索增粗而无钙化者行瓣膜闭式分离术，动态三维重建技术展示了二维显像所不能获得的房室瓣腱索的立体图像。

According to theory of diffusion and permeation,and theory of adsorpt ion equilibrium of commixture gas,the mechanism of increasing coalbed methane production by gas injection is studied, with which it is illustrated for enhancing energy of storing gas stratum, heightening pressure conduction coefficient of storing gas stratum and binging domino effect of competition adsorption by gas injection, consequently yield and ratio of recovery of coal bed methane are also enhanced.

依据扩散渗流和多组分吸附平衡理论，研究了注气开采煤层气的增产机制。研究表明，注气增加储层能量，提高储层压力传导系数并产生竞争吸附置换效应，从而提高煤层气开采时的单产量及回收率。

Group, Subgoup, Permutation Group, Cyclic Group, Commutative Group, Normal Subgroup, Factor Group, Isomorphism, Ring, Ideal, Field, Polynomial Ring, Factor Ring.

课程内容：群，子群，置换群，循环群，交换群，正规子群，商群，群之同构，环，理想，体，多项式环，商环等。

In this paper, we make investigations on polynomial functions and permutationpolynomials over finite commutative rings and several results are obtained.

本文主要讨论了有限交换环上的多项式函数和置换多项式，得到了一系列的结果。

Methods Mimicry and speculation on possible displaced amino acids in proper positions of peptide increased the biological effects of TNFR blocking peptide by compote modeling. The original peptide and its mutant were synthesized. The competitively inhibitory effects on green fluorescence protein-tumor necrosis factor fusion protein with TNFR were compared between original peptide and its mutant (receptor competitively inhibitory binding assays). The inhibitory effects on cytotoxicity were compared between original peptide and its mutant.

通过计算机模建，模拟并推测提高TNFR封闭肽生物学效应需置换的位点和氨基酸；合成原封闭肽和突变肽；受体竞争抑制结合实验比较原肽与突变肽对绿色荧光蛋白－肿瘤坏死因子融合蛋白结合TNFR的竞争抑制效应；细胞毒作用抑制实验比较原肽与突变肽对TNFR的封闭效应。

This paper lists two basic modes of connection breaking in evolving process of self-organizing network, analyses the key factor and proposes a simple and convenient links replacement algorithm based on local connected domain optimization, which can assure the connectedness in evolving processes of network.

本文列举自组织网络不连通的两种主要模式，分析了破坏连通性的主要原因，提出了一种简便可行的基于局部连通域优化的连接置换算法，可以有效保证网络演化过程中的连通性。

Consequently, when total hip arthroplasty seems indicated, patients must be ealuated carefully, especially for systemic disorders and for general debility that may contraindicate an electie major operation.

因此，当需要行全髋关节置换时，必须对病人作细致的评估，特别当患者有系统性疾病和全身衰弱时，不应行这种大手术。

This review details the history, evolution,indication and contraindication,surgical technique and clinical therapeutic effect of UKA.

本文主要对膝关节单髁置换术的发展历史、手术适应症及禁忌症、手术技术、临床疗效等方面的现状作一综述。

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