After study the present condition and the main restrain factors , the author discuss the prospect of tourism cyber - marketing and constitute the model of developing tourism cyber - marketing 结合我国旅游信息网络的发展实况和现在主要制约因素，探讨我国旅游市场开发中网络信息化的发展前景，并构造旅游业网络营销的发展模式。
Abstract : in dry area or half dry area , water is one of the main factors for afforesting the highway . it can be solved by designing in a proper way , planting in suitable seasons , ect 文摘:在干旱、半干旱地区公路绿化中水是最主要制约因素，通过合理设计、选择适宜植物生长的时期种植和采用高分子化合物等，从而达到抗旱和防治水毁的目的。
In the light of the characteristics of investigations into official crimes and the investigation patterns of foreign countries , the paper gives a deep analysis into the major limiting factors of current investigation situation 本文结合职务犯罪侦查工作的特点和外国职务犯罪侦查的模式,较深入地分析了当前职务犯罪侦查的几个主要制约因素。
In the end , on the basis of grasping the major influence factor and the general principle of shannxi rural surplus labor transfer , the paper put forward the specific transferring mode from angles of zone type and natural geography 最后，在把握陕西省农村剩余劳动力转移的主要制约因素和其转移的一般原则的基础上，本文从地域类型角度和自然地理角度提出了陕西农村剩余劳动力的具体转移模式。
Chapter two describes the advantages and disadvantages of western development . chapter three discusses many strategies and its analysis of western development . creative and original strategies that are made are critical to develop the western region 第二章论述了西部大开发的有利条件和面临的主要制约因素，从而看到优势，找到差距，为西部大开发找出症结，开出良方，制定切实可行的西部大开发战略。
Based on the background of sustainable development and focused on the building materials industry , the specific economic field , the paper gives a detailed analysis to the existing problems concerning non - sustainable development happening in the traditional building materials industry and the root causing these problems , and it also proves the features of green building materials , with a view to develop green building materials markets to effect sustainable development in building materials industry in the mode of economic increase in accordance with environmental protection . the paper discusses the necessity and feasibility of developing green building materials in china . in comparison with the situation of the green building material markets in the developed countries , the paper analyzes the current situation , the features , the prospect and some main restrictive conditions of our green building materials market , based on which it gives some suggestions about how to develop the green building materials market 本文在可持续发展的背景下，着眼于建材产业这个具体的经济领域，深入分析了中国传统建材产业目前存在的问题和不可持续发展的现状及问题的根源，论证了新型绿色建材的环境协调性，提出了建材行业必须走发展绿色建材实现环保型经济增长方式之路的观点；论文从环境与经济关系入手，详细地分析了中国经济实现环保型经济增长的必然性以及我国建材产业发展绿色建材的必要性和可行性；着重从市场的角度，比照国外发达国家绿色建材市场发展现状和水平，分析了我国绿色建材市场的发展状况、市场特点和阻碍其发展的主要制约因素，并对如何发展绿色建材市场提出了作者自己的建议。
The results demonstrate that the pingba red residua is a typical in situ chemical weathering crust , and the material sources of the profile are derived from underlying triassic dolomites , the chemical weathering of dolomite can be divided into two stages : " leaching - accumulating trend " and weathering trend " , the stable teconic and whole weathering of dolomite should be the main reason for the development of thick and consecutive red weathering crust overlying dolomite rock in central guizhou 结果显示该剖面是下伏基岩白云岩风化成土并累积的结果，无其他外来物源，是原位风化壳；成土过程具有两阶段模式特征，即白云石、方解石的溶蚀酸不溶物累积和酸不溶物进一步风化两个阶段；长时期的构造稳定和白云岩整体溶蚀作用是黔中地区白云岩风化壳土层厚度大、分布连续的主要制约因素。
This paper makes impersonality estimate on meixian county ' s resource condition and the present agro - developing situation through the guideline choice , model structure decision , computer simulation and debugging of the project . it makes a comprehensive analysis on the running mechanism of the county ' s agro - economy regional system , the latency advantages and the main restrict factors and makes a scientific estimate on the next five - year or ten - year development trend . via programming and adjustment , the agro - economy system can develop much more stability , utility and harmony 本次研究通过指标体系选择，模型结构确定，微机模拟运行，以及方案调试，对眉县的资源环境结构和农业发展现状做出客观的评价，对全县农业经济地域系统的运行机制、潜在优势和主要制约因素进行综合分析，对系统在下一个五年或十年的演进趋势做出科学估计，进而通过规划，调控发展进程，使全县农业经济系统稳定、协调、高效的发展。
Through analyzing the necessity for conducting ppp in urban rail transit projects and its main restrictions , this paper puts forward some policy suggestions for defining the objectives of transport demand and project conditions , clarifying the responsibilities between the government and private sectors , setting up the sustainable mechanism for the reward of investment and improving the effective supervision system 摘要通过分析城市轨道交通项目公私合作模式( ppp )的必要性，针对存在的主要制约因素，提出确立交通需求目标及项目条件、界定政府与民营部门的责任、建立项目可持续经营的投资回报制度、完善有效监管制度等方面的政策建议。
In all , the sustainability of land use of taigu is on the basic development level , productivity and economic feasibility greatly influence on the land sustainable use , however , resource protection and social acceptability restrain its development . as a conclusion , some measures are put forward in this thesis 综合评价结果表明：近几年，太谷县土地利用处于基本可持续阶段，影响最大的是土地生产力水平和经济可行性，但目前主要制约因素是资源保护和社会可接受性，为此提出太谷县土地资源可持续利用的对策。
