优势的

The average heterosis of spike number per plant and 1 000-grain-weight were high and obviously related to yield heterosis at 0. 01 and 0. 05 level, respectively; the average yield heterosis of F1 hybrids between common wheat and club wheat was 77. 19%(ranged from-2. 18% to 143. 42%), the average heterosis of spike number per plant and spike grain number were high and both was also obviously related to yield heterosis at 0. 01 level.

结果发现：小麦种间杂种在产量上具有明显的杂种优势，其中斯卑尔脱小麦与普通小麦所配的30个种间杂交组合产量杂种优势平均为109.24%(43.14%～187.96%)，单株穗数及千粒重平均优势较大且与产量优势的相关分别达极显著水平和显著水平；密穗小麦与普通小麦所配的30个种间杂种的杂种优势为77.19%(-2.18%～143.42%)，单株穗数和主穗粒数优势较大且与产量优势的相关均达极显著水平。

This thesis systematically studies the comparativeness of Chinese trade in services in four aspects of indices basing upon existing achievements by using quantitative analysis method and qualitative analysis method. Moreover, the indices have been compared with those of the five transitional countries in the same timing period. Three points can be drawn from that study. First, the comparativeness of Chinese trade in services are too weak to compete internationally. Secondly, tourism is the only industry that holds its comparative advantage. Finally, we can learn from what the Poland and Hungary have been doing with their trade in services.

本文采用了定量分析与定性分析相结合等研究方法，在前人研究的基础上，对1995-2000年我国服务贸易的国际市场占有率、比较优势指数、显示性比较优势指数和显示性竞争比较优势指数四个指标进行了计算，较全面、系统地分析了我国服务贸易的国际竞争力，并首次将该四项指标结果同一些转轨经济国家的相同指标进行跨国比较，从中得到三点启示：1、我国服务贸易整体不具备竞争优势；2、旅游业是我国服务贸易中具有较强比较优势的行业；3、波兰和匈牙利两国的成功经验对我国发展服务贸易有一定借鉴作用。

Facing the fierce competition on international trade in services, studies on China's counteraction are essential for enhancing overall national strength.

比较优势是获取竞争优势的条件，竞争优势则将潜在的比较优势转化为现实优势。

by calculating the rca of guangxi in recent years and its ntr index of 2006, the author comes to the conclusion: compared to other provinces in china, the superior industries of guangxi are mainly labor intensive industry and resource intensive industry; and food manufacturing industry, chemical industry and paper making industry are increasingly developing, which have become the new advantages in export; electromechanical products and hi-tech products of guangxi are inferior to those of other provinces in china.

文章计算了广西近几年的显性比较优势指数和2006年贸易竞争力指数，通过综合分析得出广西出口产业的比较优势格局：广西相对于全国具有比较优势的产业主要集中在资源密集型和劳动密集型产业，且部分产业的优势地位趋于减弱；近年广西重点发展的食品制造、化工、造纸等产业发展较快，已成为在全国具有强比较优势的出口产品；机电产品和高新技术产业处于明显的比较劣势地位。

This dissertation consists of the following seven chapters:Chapter 1 presents a general commentarial description of the existing research literature.

本章在分析比较优势内涵和比较优势原理的基础上，主要论述了比较优势的来源以拓展比较优势理论，从而为研究比较优势理论在中国产业发展中的应用提供基本的理论框架和分析基础。

But to make good use of them, their genetic characteristics and germplasm relationship with Chinese inbred lines representing different heterotic groups should be studied.

本研究采用传统的配合力和杂种优势分析与现代的SSR分子标记技术相结合的方法，探讨引进南斯拉夫玉米自交系与我国不同优势类群骨干自交系的配合力、杂种优势、遗传距离和杂合性，为引进自交系的高效合理利用提供理论依据；并通过各项遗传指标与F1产量的相关分析，探讨各项指标预测杂种优势的可行性和效果。

However, due to the substantially different allocation of resources in various geographic regions, along with their own characteristic formation, agglomerate economies show rather a strong tendency of unhomogeneity, which leads to the unhomogeneous characteristics of their advantages regarding FDI attraction. Therefore, this paper proposes there exists an interactive relationship between the primary advantage and the multi-level agglomerate advantages by dividing the latter one into original agglomerate advantage and late-developing agglomerate advantage.

本文认为虽然随着经济全球化和信息技术的进一步发展，基础性优势的重要性逐步下降，从一种显性优势转化为潜在优势，是东道国吸引FDI的一种比较优势，集聚性优势则起着越来越重要的作用，是东道国吸引FDI的一种竞争优势，两者之间存在着质的差别，但作为分别作用于国家和次国家两个不同层面上的优势，基础性优势和集聚性优势之间存在着互动互补关系，基础性优势是集聚性优势形成的前提，集聚性优势则是对基础性优势的提升，两者共同构成了东道国吸引FDI的二重优势，在东道国吸引FDI中缺一不可。

Among all the export commodities, the increase of machinery and transport equipment"s export is rapidest and most obvious. Therefore, it is necessary to make an analysis about whether China"s machinery and transport equipment have comparative advantages.This thesis reviews the history of the comparative advantage theory at first and points out their different influences on the developing countries economic development. Then the thesis explains the forms and the decisive factors of the comparative advantage in detail and analyses the inherent mechanism under which these factors impel the comparative advantage to change.

本文首先回顾了静态比较优势理论和动态比较优势理论的发展历史，并指出了它们对发展中国家经济发展的不同影响；然后详细阐述了动态比较优势的表现形式和决定因素，分析了这些因素促使动态比较优势转变的内在机制；然后结合显示性比较优势指数以及净出口指数对我国的出口商品以及机械与运输设备进行分析，指出我国出口的机械与运输设备正处于一个转型时期，并将我国的该大类产品和同期的韩国该大类商品进行了比较，指出我国机械与运输设备商品所面临的问题。

In maize, the results indicated that the patterns of gene expression altered obviously in cross-fertilized kernels as compared to self-fertilized kernels, major difference of gene expression occurred in the qualitative level. Further analysis indicated that higher percentage of total differentially expressed cDNA was observed in highly heterotic hybrid than in non-heterotic hybrid.

对四个不同优势的玉米杂交和自交在种子发育前期基因表达研究表明，玉米杂交种子与自交种子在发育前期存在明显的基因表达差异，强优势的杂交组合与弱优势杂交组合之间表现差异的总cDNA比例存在极显著差异，进一步分析发现，杂交特异表达与杂种优势存在一定的正向关系。

Further more, high-oilized normal corn could also be used as seed in high oil corn production.

因此，如何提高杂种优势的潜力，发展新的高产玉米生产系统成为玉米育种的重要课提高玉米杂种优势的途径主要有两种：一是继续提高自交系间杂种优势水平，对此国内外已多有研究；二是利用杂交种间优势，也就是通

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