四对的

For distinctly understanding the mutual influence between the structural units, a series of compounds from five and six-membered C-N heterocycle substituting the tetrazine ring are designed. These several types of compounds are studied by means of the quantum chemistry calcualtions and discussed the influence of the structural units upon the main performance (heat of formation, density, velocity and pressure of detonation) and found out the best combination of performance.

为了更清楚的了解结构单元之间的相互影响，设计了六元氮杂环和五元氮杂环取代1，2，4，5-四嗪得到了一系列化合物，采用量子化学计算方法对它们进行了详细的理论研究，讨论了各种氮杂环的改变对四嗪类化合物性能(包括生成热、密度以及爆速和爆压等)的影响，并找出爆轰性能较好的结构单元组合。

In the same way, a Four-coloring of a maximal planar graph of 25 order G(subscript M25), is obtained with "simplified method of reduction of order".

利用"简化降阶法"对一个一定拓扑结构的12阶最大平面图G(下标 M12)进行着色，得到G(下标 M12)的四色着色方案；以同样的方法对一个一定拓扑结构的25阶最大平面图G(下标 M25)进行着色，得到了G(下标 M25)的四色着色方案。

It is found that the sample stained with silver methenamine instead of mercaptoacetic acid-osmium can prevent the false phenomena caused by the inappropriate use of mercaptoacetic acid.

摘 要：本文将六亚甲四胺银染色法作为加工毛发的电子染色剂得到较好的电子显微图像，并系统地比较了用巯基乙酸-锇法染色的羊毛样品和用六亚甲四胺银染色的人发样品的超微结构，认为对深加工过的毛发样品用六亚甲四胺银法替代巯基乙酸-锇法染角蛋白，可以防止巯基乙酸使用不当引起的假象。

The paper is divided into four parts. The prologue, the first, the second and the third part of the paper mainly discuss the person of Yang Zhu, the social background of his thinking, his basic ideas, the relationship between the thinking of Yang Zhu and Confucian, Taoist and Monist and also the analysis of the reason for the demise of his thinking.

本论文共分四章，引言及第一、第二、第三章、第四章主要探讨杨朱其人、其思想产生的社会背景、杨朱的基本思想和杨朱思想与儒家、道家、墨家的关系及其思想消亡的原因分析，结语对前面进行简单概括并对前面尚无论及的部分进行必要的说明。

After that, this thesis study these four management and control mode from different aspects, they are the management orientation of the parent company, the appropriate framework, the function partition of parent company and subsidiary company and the evaluation system of performance of the subsidiary company.

接着在第四章中对这四种管理控制模式从母公司的管理定位、适合的组织结构、母子公司的职能分工，以及子公司的绩效评估体系这四个方面进行了具体的展开。

The total DNA has been extracted from the fresh leaves of 4 medicinal species of pteridophyte with CTAB, SDS, to compare their effects on DNA extraction. The result shows that the optimum preparation method obtained to extract high-quality DNA lays theoretic and practical base for PCR amplification and primer design, for filtrating related gene of the active elements from leaves of the four pteridophytes.

以四种药用蕨类的叶片为材料，采用改进的CTAB法、SDS法分别对四种蕨类进行了总DNA提取效果的比较分析，结果表明，通过实验获得最佳的DNA提取方法，为PCR扩增，引物设计，为筛选四种药用蕨类中的活性成份的相关基因奠定理论和实践基础。

Many researchers have devoted their work to the development of modal analysis extraction techniques in order to obtain more reliable identification of the modal parameters. There are many damping identification methods, but each one has different merit and defect. In order to find which one is the most reliable method with respect to certain characteristics, this thesis focus on how to identify structure's damping in time domain. The following works have been done in this thesis: 1. Investigate four modal analysis methods——the LSCE Method, the Ibrahim Time Domain Method, the Time Domain Collectivity Modal Parameter Method, the Rational Fraction Polynomial Method and improve on the ITD Method in arithmetic.

本文主要做了如下工作： 1、集中研究了四种常用的模态识别方法，即最小二乘复指数法、Ibrahim时域法、时域总体模态参数辨识法及有理分式多项式法，并对ITD法在算法上进行了一定的改进； 2、建立结构动力模型，利用这四种方法在具体条件下识别结构的阻尼，并绘制相应的图； 3、讨论不同的情况下，不同的识别方法对阻尼识别精确性的影响； 4、基于业已明确的阻尼识别的精确性，根据研究的需要，指出在实际的识别过程中，如何选择最佳的识别方法以及识别过程中需要注意的问题； 5、选择最为精确的阻尼识别方法，以导师李书进教授在日本京都大学防灾研究所强震反应实验室所做的一足尺木制结构房屋的动力测试实验为实测模型，识别其阻尼； 6、在本文的最后，尽作者所知，提出了一些需要改进的地方，并对未来的研究方向给出了作者的建议。

Four examples exist from four separate conflicts that call into question the efficacy of non-BAI interdiction: Operation Strangle (Italy, 1944); Operations Strangle and Saturate (Korea, 1951-52); French interdiction efforts against Vietminh supply lines, 1952-54; and the long and arduous campaign against the Ho Chi Minh trail network over a decade later.

有四个分别发生在四个没有关联的冲突中的例子可以提出对非BAI遮断的质疑：绞杀战（意大利，1944）；绞杀行动与饱和轰炸（朝鲜，1951-52）；1952年-54年法国人对越盟补给线的遮断努力；以及十年之后针对'胡志明小道'长期而又艰难的轰炸行动。

The detectable group, biotin-ε-aminocaproic acid N-hydroxysuccinimide ester, is attached to the remaining amino group. A series of multiamine compouds, i. e. ethylendiamine, 1, 6-hexandediamine, triethylenetetramine, tetraethylenepentamine, and synthetic polyarylamide are used inlabelling, it is found that linker arms and steric hindrance effect the detection sensitivity. The probes labeled by 1, 6-hexandediamine and triethylenetetramine can detect 0.1-0.5pg target DNA in dot blot hybridization, and their sensitivities are better than the others.

本文详细考察了乙二胺、己二胺、二乙烯三胺、三乙烯四胺、四乙烯五胺及合成的聚乙烯胺化合物对λDNA探针的标记和检测的影响，发现胺化物链长和空间位阻影响探针的杂交和检测，用己二胺和三乙烯四胺标记的生物素探针在杂交24小时、显色8小时后检测灵敏度达0.1-0.5pg，超过其它胺化物标记的探针。

3Goal setting increased the occurrence of flow experience,especially on thedimensions of Action-awareness merging,Sense of control,Loss of self-consciousness,Autotelic experience,and the total for the dispositional flow,while onthe dimensions of Challenge-skills balance,Sense of control,Loss of self-consciousness,Autotelic experience,and the total for the state flow.

3目标设置能促进体育运动中流畅状态的发生，其对特质流畅中&行动-意识融合&、&控制感&、&自我意识的丧失&和&享受的体验&四个维度及总分有显著促进作用；对状态流畅中&技能-挑战平衡&、&控制感&、&自我意识的丧失&和&享受的体验&四个维度及总分有显著促进作用。

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。