首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   8922篇
  免费   527篇
  国内免费   425篇
林业   1836篇
农学   603篇
基础科学   480篇
  868篇
综合类   4926篇
农作物   240篇
水产渔业   146篇
畜牧兽医   467篇
园艺   162篇
植物保护   146篇
  2024年   38篇
  2023年   138篇
  2022年   195篇
  2021年   250篇
  2020年   266篇
  2019年   272篇
  2018年   129篇
  2017年   218篇
  2016年   331篇
  2015年   294篇
  2014年   526篇
  2013年   473篇
  2012年   904篇
  2011年   860篇
  2010年   684篇
  2009年   639篇
  2008年   626篇
  2007年   682篇
  2006年   505篇
  2005年   351篇
  2004年   273篇
  2003年   293篇
  2002年   232篇
  2001年   168篇
  2000年   152篇
  1999年   83篇
  1998年   58篇
  1997年   47篇
  1996年   36篇
  1995年   31篇
  1994年   27篇
  1993年   21篇
  1992年   23篇
  1991年   9篇
  1990年   8篇
  1989年   10篇
  1988年   8篇
  1987年   5篇
  1986年   3篇
  1985年   1篇
  1984年   1篇
  1982年   1篇
  1981年   1篇
  1978年   1篇
  1955年   1篇
排序方式: 共有9874条查询结果,搜索用时 15 毫秒
131.
132.
Construction and relative service is one of the important categories in international service trade set down by WTO. In order to strike a construction agreement, the developed countries and districts have designed a lot of prevailing standard treaty wording, in which FIDIC plays the most important part. We should take advantages of their experience to improve our standard treaty wording.  相似文献   
133.
The conservation of historic buildings and their environment is an unavoidable problem in urban construction. In this paper, the authors give a few new thoughts about the problem. First, the historic buildings are important part of the core power in city competition.Second,the conservation work should be combined with their development. Third, a classified and multilevel system of protection and reuse of old buildings should be set up.  相似文献   
134.
Construction industry is not only the pillar industry in national economy,but also the typical industry with intensive labors.As a major part of the construction industry,the Construction Employment System(CES) is an important factor of the market order,as well as the quality,the safety and the development of the industry.It is also an important part for building a harmonious society.It concerns the social harmony,political harmony,societal harmony,cultural harmony,urban-rural harmony,etc.However,at present,there are still many problems in CES that might influence the harmonious society building.This paper advises to speed up the reformation of CES,to establish and consummate the system of construction labor subcontract,to develop vigorously labor subcontract corporations,to improve the quality of the labors,to ensure the rights and interests of the labor.  相似文献   
135.
The agent - construction system, as a new public project management mode, has been practiced in some cities and attracted attention from the society. This paper firstly studies the features and operation modes of agent - construction system, and discusses the agent - construction system from the viewpoints of promoting competition, nourishing agent -construction enterprises, setting up a supervisory and encouraging mechanism, and its connection with the governmental project procurement system etc.  相似文献   
136.
With social development, the environment has become one of the major topics in human life. Although the construction project may improve economy and environment, it also may exert negative impact on environment. Cost, schedule and quality are three important objectives of construction project and on the objective of environment have not been focused. The author of this paper reiterated the importance of environmental control for the construction project and key areas to be focused on during the whole process of construction project.  相似文献   
137.
138.
As a product of work division and cooperation in construction industry,the construction supervision has contributed actively to China's construction.As the international and home situations have changed,a higher requirement has been put for China's construction supervision sector.Based on the principles of generalization and comparison this paper studies and discusses the existed problems on sustainable development of construction supervision sector in the ideological recognition,the theoretical study,the administrative system,the code building and the practical manipulation,etc.and corresponding suggestions are given on this basis.  相似文献   
139.
Based upon the conception of the least loop,the most loop and direction factor presented by the author firstly,the algorithm of searching out the least and most loops has been designed.By building the adjoining matrix, confirming the start-point of searching,vectorizing the searching sides,calculating the direction factor of adjoining sides,we can search out the next side of the least loop or the most loop rapidly.With a valid searching side being confirmed at every searching and the searching scope being reduced by forming degenerate graph,the time compexity of the algorithm is much less. In the research of the automatic calculating system of construction quantities, the problem of houses partition and out-wall partition had been solved succesfully by utilizing this searching algorithm.  相似文献   
140.
基于对目前产品平台设计的研究综述,分析并指出了研究中的不足。介绍了产品平台的概念和特征,探讨了基于公共平台的产品族设计方法。提出了基于主从关联结构的层次优化设计理念,以及实现这一理念的方法和模型框架:并对模型的数学形式、模糊层次优化做了阐述。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号