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   116653篇
  免费   7090篇
  国内免费   10579篇
林业   7905篇
农学   5868篇
基础科学   5817篇
  11351篇
综合类   57225篇
农作物   8020篇
水产渔业   5423篇
畜牧兽医   18752篇
园艺   8722篇
植物保护   5239篇
  2024年   960篇
  2023年   2519篇
  2022年   5480篇
  2021年   5236篇
  2020年   5030篇
  2019年   4958篇
  2018年   3424篇
  2017年   5704篇
  2016年   3729篇
  2015年   5679篇
  2014年   6010篇
  2013年   7251篇
  2012年   9969篇
  2011年   10259篇
  2010年   9950篇
  2009年   8802篇
  2008年   8790篇
  2007年   7767篇
  2006年   6337篇
  2005年   5025篇
  2004年   3123篇
  2003年   1855篇
  2002年   1995篇
  2001年   1771篇
  2000年   1624篇
  1999年   580篇
  1998年   68篇
  1997年   47篇
  1996年   22篇
  1995年   32篇
  1994年   33篇
  1993年   33篇
  1992年   38篇
  1991年   22篇
  1990年   11篇
  1989年   6篇
  1988年   7篇
  1987年   30篇
  1986年   20篇
  1985年   3篇
  1981年   16篇
  1976年   3篇
  1966年   3篇
  1965年   3篇
  1964年   5篇
  1963年   2篇
  1962年   31篇
  1957年   3篇
  1956年   36篇
  1955年   14篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
The conception and calculation formula on torsion-warping stability function is brought forward and the torsion-warping tangent stiffness matrix of bi-axisymmetric open thin wall and lightweight beam-column element is derived for the first time, based on torsion-warping stability interpolation function. At the same time, the spatial geometric tangent stiffness matrixes for beam-column element of lightweight steel structure based on tension-compression and torsion warping stability interpolation function are presented as well.  相似文献   
992.
Based on the experimental study of the compound rock's behavior at rock salt's over-layer under single compression and tri-axial compression condition, the basic mechanical properties of the rock have been obtained. It could serve as reference to research work and production.  相似文献   
993.
This paper is focused on early warning of corporation financial crisis for the China's household electric appliance manufacturers in stock market. Firstly, using company's open-disclosed annual statements as data resource, the financial indexes system is constructed. Secondary, adopting the multivariable statistical analysis method, such as cluster, discriminate and principle component analysis, the multivariate models for the empirical study on early warning of financial crisis by making use of SPSS statistical software are set up. The corporation might discover the financial affairs crisis that shall probably arise beforehand by using the financial affairs crisis early warning system. This study and analysis may serve as reference for domestic industries and enterprises.  相似文献   
994.
Based on experience in customer service evaluation,through the analysis of many factors affecting customer satisfaction calculation estimate, customer service evaluation rules as well as customer-oriented and supply chain partner-oriented methods are developed and discussed from the view of supply chain, besides, we construct two sets of customer satisfaction evaluation systems, in which we perform non-dimensional analysis on evaluation system to form single factor evaluation matrix after using improved AHP to determine each factor item's weighting ,utilizing fuzzy decision theory to construct evaluation model for integrated estimate. This evaluation method is scientific, round and objective with more stability and convienience in practical use.  相似文献   
995.
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   
996.
Along with the establishment of the constructor association,how to locate the constructor association is extremely important at present,which is not only related to the efficiency of the constructor trade management,but also related to the future development of the constructor trade.This paper launches the discussion on the constructor association's localization from three aspects,namely the legal localization,the profession localization and the relation localization with the government and its members,and puts forward some proposals and individual opinions.  相似文献   
997.
998.
Bill of material of product is data about product structure, and plays an important role in product information management. The paper analyzed characteristics of product BOM, and put forward a product BOM management method based on single layer BOM, witch can well meet requirements of product BOM.  相似文献   
999.
In order to realize elastic-plastic analysis in geotechnical FEA, in this paper, firstly, the method how to realize elastic-plastic analysis in Super-Sap is discussed. Then, this paper stresses to introduce the principle and the steps used to achieve the accomplishment of elastic-plastic analysis in Super-Sap. Finally, an engineering practice is given to prove that the geotechnical FEA elastic-plastic analysis and visualized post-processing can come true by it rapidly.  相似文献   
1000.
Intelligent recognition system of gun code is designed , which achieves online recognition of gun code. We applied video camera to get image, and some special technique in this deformed character recognition. As well, we applied dynamic template matching to get a better result.  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