两对

So the results made it clear that these two phytoplasma strains are one of the members of Aster yellows phytoplasma group (16SrI-B, rp-B group).

本研究同时还运用PCR-RFLP技术对上述两个植原体株系进行酶切图谱比较分类鉴定以及确定来源不同的苦楝丛枝病植株是否存在不同亚组的植原体株系复合侵染的现象，结果也表明这两个株系均属于翠菊黄化组B亚组，且采自不同省份的两个苦楝丛枝病植株没有植原体株系的复合侵染。

At least two separate inhibitory actions on 5-HT3A receptors could be identified for propofol, whereas the enhancing action seen for the two related smaller phenol derivatives could no longer be detected. 5-HT-dependent and 5-HT-independent interactions could be distinguished for all three drugs.

异丙酚被证实对5-HT3A 受体至少有两种相互独立的作用，而在两种相关的较小分子的酚类衍生物中所看到的增强作用则不能被检测到。5-HT 依赖和5-HT 非依赖两种相互作用因为这三种药物而著称。

By the combinatorial proof or combinatorial interpretation, the identity is equipped with certain count meaning. The most general way in the combinatorial proof is to count two sides of the identity by two different methods. Generaly, through building a bijection from one set to another one, the number of the two sets respectively represents the two sides of the identity.

恒等式的组合证明或组合解释赋予了恒等式一定的计数意义，组合证明最常用的方法是分别用两种不同的方法对恒等式的两端进行计数，一般通过构造两个集合之间的双射，这两个集合的个数分别表示恒等式的两端，从而根据双射的一一对应性证明恒等式。

Moreover, by the combinatorial proof or combinatorial interpretation, the identity is equipped with certain count meaning. The most general way in the combinatorial proofs is to count two sides of the identity by two different methods. Generaly, through building a bijection from one set to another one, the number of the two sets respectively represents the two sides of the identity. Because of the 1-1 property of bijection, the identity is proved.

此外，恒等式的组合证明或组合解释赋予了恒等式一定的计数意义，组合证明最常用的方法是分别用两种不同的方法对恒等式的两端进行计数，一般通过构造两个集合之间的双射，这两个集合的个数分别表示恒等式的两端，从而根据双射的一一对应性证明恒等式。

Bipedalism might feel natural to us, but in fact it's a specialized adaptation that is rather difficult compared to walking on all fours - no wonder most apes and monkeys avoid it. It also explains our prevalent lower back pain.

对我们来说，我们可能感觉两足动物很自然，但是，事实上，两足行走比四足行走难多了，所以，大多数猩猩和猴子避免两足行走也不足为奇，这还解释了我们经常腰疼的原因。

The form discussion studies Liang Zongdai and Ye Gongchao respectively introduced and spreaded the French imagism and British and American formalism. The Poem special issue in the literature and art supplement of Ta kung Pao Newspaper and New Poetry organized twice discussions in poetic forms. The pure poetry school introduced that the modernists introduced the western and ancient pure poetry theories: from Baudelaire, Mallarme, Vale'ry, H. Read, A. Bremond to J.M. Murray, and the basic idea and difference of pure poetry. Besides, a lot of modem poets became greatly interested in pursuit heat of the pure poetry in late Tang and Nan Song dynasties, studying the development and variation of pure poetry. Music theory argues that modernists make introduction and reform on the western and Chinese music theory. He Qifang and Bian Zhilin continue the topic to the contemporary time, and put forward the theoretical frames in Chinese poetry. Rhyme and rhythm theory make researches on the introduction and reform of French symbolism and British and American modernists' rhyme and rhythm theory, making studies on the Chinese new form poetry and its thyme and rhythm theory.

纯诗论是形式论的重心；对西方和古代的纯诗理论之引入，引进了从坡到波德莱尔、马拉美、瓦莱里、默里、里达、白瑞蒙的纯诗理论；纯诗理论的基本内涵与差异；诸多现代派诗人掀起了晚唐南宋纯诗热，对姜夔、严羽作了新的理解；对纯诗理论的发展和变异，含梁宗岱的现象学形式论，何其芳的唯美论与形式论，现代派诸人的诗本体论；梁宗岱对纯诗理论的中国化研究，含梁宗岱的超越性与形式性，"超验"与"妙悟"的比较研究与形态超脱性的比较研究；中西纯诗形态的超脱性等；现代派纯诗论是对初期白话诗理论的清算，对新月派、象征派探索的总结和发展，音乐论是对纯诗论的延伸和对格律论的发展；现代派引入研究了西方诗学音乐论理论，含坡、瓦莱里、里德的纯诗音乐论、抽象音乐论、各种具体的音乐论技术论点；引入了中国古代诗学中关于诗与音乐、音韵、音顿、音义、平仄双声叠韵等音乐的理论；进行了两次关于新诗音乐论的大讨论；在节奏、音顿、音韵三方面借鉴了西方的理论，同时改造了古代的格律理论，扬弃了平仄说，何其芳、卞之琳把新诗音乐论命题延续到当代，提出了汉诗音乐论的理论框架。

In chapter four, the dissertation analyses different types of the symbiosis relationship between the independent college and its matrix school from the dimensions of organization and behavior, namely point symbiosis, intermittent symbiosis, constant symbiosis, integration symbiosis, parasitism, commensalism, symmetric mutualism and dissymmetric mutualism. It establishes twenty eight symbiosis morphologies between the independent college and its matrix school. What\'s more, it puts forwards two basic modes for the independent college\'s evolution, and has empirical studies on two typical cases.

第四章从组织、行为两个维度，分析独立学院与母体高校共生的各种类型，即点共生、间歇共生、连续共生和一体化共生，寄生、偏利共生、非对称性互惠共生和对称性互惠共生，确立独立学院与母体高校的28种共生形态，提出独立学院演变的两种基本模式，并对两个实际典型案例进行实证。

The thesis studies the difference between GWSs composition and traditional workflow applications, proposes the implement mechanism and technical architecture of GWSs composition and defines the reference model of GWSs composition platform, which provide holistic framework and top-level guidance for studying dynamic GWSs composition technology, designing GWSs composition platform, and implementing representative composite service applications.2、Theories and methods of composite process modeling and process analysis. This thesis proposes a meta-model of Geo-spatial Web services composition process defining from two aspects, i.e. process and resource. According to the process definition meta-model, we propose a new Geo-spatial Web services composition Process/Resource model based on extended WF-net, which effectively resolves the problems on uncertain activity option and dynamic variation of service in composite process model. A notion with regard to soundness of process model is proposed from three aspects, i.e. the structural correctness of process model, validity of data link and validity of resource. The notion of soundness definitely gives a dividing line on correctness of composite GWS process. This thesis analyzes sufficient and essential terms of soundness, and studies compositional property of WSCP/R-net models which provides an effective method to construct a soundness WSCP/R-net model. According to WSCP/R-net, the thesis proposes composition algebra and studies the properties of it. Based on the composition algebra, 6 kinds of composite process reduction rules are induced to optimize the process.3、Geo-spatial Web service QoS model and its application architecture. This thesis proposes an extendable GWS QoS model from three aspects, i.e. Geo-spatial Web Service itself, networking conditions and service consumer which can be used to distinguish GWSs with overlapping or identical functionality. We work over the QoS evaluation methods of composite GWS process which can be used to guide the execution, monitor and service selection of composition process. Aming at some disadvantages in traditional Web service discovery model for its lacking of QoS supporting, this thesis proposes a new service discovery model SDMQ supporting QoS constraints.4、Technologies of composite service executing. SSPL, a new composite service process language, is defined to overcome the disadvantages of existing composite services process languages which can not adapt to the dynamic variation of Geo-spatial Web Services. An algorithm is described to translate WSCP/R-net model into SSPL. The thesis studies the model of dynamic services selection with QoS global optimization, presenting an algorithm GODSS to resolve dynamic services selection with QoS global optimization in GWSs Composition.5、Design and implement experimental system and representative applications. According to the research findings presented above, we design and implement an experimental system and construct two representative applications to show that our achievements are effective and practical.

针对当前空间信息服务聚合研究中存在的若干不足，本文重点在基于工作流的空间信息服务聚合框架、空间信息服务聚合流程建模和分析技术、空间信息服务QoS模型及应用体系以及空间信息服务聚合流程执行等几个方面进行深入研究，主要工作和创新点包括：1、基于工作流的空间信息服务动态聚合框架：研究了空间信息服务动态聚合和传统工作流应用的不同，在此基础上提出了基于工作流技术的空间信息服务动态聚合实现机制、技术体系和参考模型，为研究空间信息服务聚合的关键技术、开发服务聚合支撑平台以及在此基础上构造特定的空间信息服务聚合应用提供了总体框架和顶层指导。2、空间信息服务聚合流程建模和分析技术：首先基于动态服务聚合流程建模的需求和空间信息服务动态变化的应用实际，从服务聚合的过程维和资源维出发定义了服务聚合流程定义元模型；与之相对应，对基本的WF-net进行扩展，提出服务聚合流程/资源网作为空间信息服务聚合流程的形式化描述模型，有效解决了现有的基于基本Petri网和工作流网的服务聚合建模方法所不能解决的不确定路径选择和服务的动态变化性问题；从流程结构正确性、数据依赖有效性和资源实现有效性三个方面提出了WSCP/R-net健壮性的概念，明确界定了聚合流程正确性的标准，并对WSCP/R-net模型的健壮性分析方法和WSCP/R-net模型的组合特性进行了研究；提出了空间信息服务聚合代数算子并对其性质进行了研究，在此基础上提出了6种聚合流程约简规则，从而可达到优化聚合流程、提高聚合流程执行效率的目的。3、空间信息服务QoS模型和应用体系：从服务本身、网络环境和服务消费者三个层次出发，提出了一个可扩展的空间信息服务QoS模型GSQM，实现了对空间信息服务的度量和评价，并对GSQM不同质量要素信息的客观、公正采集方法进行了研究；研究了空间信息服务聚合流程QoS评价方法，有效支持了空间信息服务聚合流程的执行、监控以及服务选择等操作；针对目前的服务发现模型仅支持服务功能性描述、不能有效满足空间信息服务应用需求的现状，提出了一种新的支持QoS约束的服务发现模型SDMQ，并对模型的实现框架进行了研究。4、空间信息服务聚合流程执行技术：针对现有的服务聚合流程描述语言不能有效满足空间信息服务动态聚合流程描述的特点，基于BPEL4WS提出了一种新的空间信息服务聚合流程描述语言SSPL；研究了满足健壮性要求的WSCP/R-net模型向SSPL的转换算法，在此基础上可以满足用户无显式编码来实现空间信息服务聚合应用的目的；研究了服务动态选择QoS全局优化模型，并在此基础上提出了一种解决服务动态选择QoS全局优化问题的实现算法GODSS.5、基于论文研究成果，设计实现了"空间信息服务聚合实验系统"，并构建了"矿产资源评价"和"城市消防应急响应"两个典型应用案例，对论文所述模型、方法的可行性和有效性进行了验证。

Two different Fabry-Perot cavities have been adopted: plane mirror cavity and confocal concave spherical mirror cavity.

采用了两种不同的Fabry-Perot腔体结构：平面腔镜结构和对称共焦球面腔镜结构；首先进行了理论分析，得出两种结构中折射率变化与干涉条纹变化的关系，然后分别对两种腔体结构下的测量系统进行实验研究，都可以探测到10-5量级的折射率变化量，结果基本令人满意。

The experimental result show that they are better than the Gomory cutting plane method on the average.

提出了交替地使用两个出平面和同时使用两个割平面去求解纯整数规划模型的两种新方法，并对这些算法进行了测试对比。结果表明：总体而言，它们都优于Gomory割平面法

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。