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   22849篇
  免费   1430篇
各国政治   1108篇
工人农民   986篇
世界政治   1706篇
外交国际关系   962篇
法律   14427篇
中国共产党   2篇
中国政治   148篇
政治理论   4789篇
综合类   151篇
  2023年   113篇
  2021年   134篇
  2020年   516篇
  2019年   581篇
  2018年   706篇
  2017年   752篇
  2016年   831篇
  2015年   608篇
  2014年   690篇
  2013年   2753篇
  2012年   631篇
  2011年   657篇
  2010年   675篇
  2009年   711篇
  2008年   652篇
  2007年   703篇
  2006年   702篇
  2005年   633篇
  2004年   636篇
  2003年   542篇
  2002年   610篇
  2001年   784篇
  2000年   714篇
  1999年   575篇
  1998年   321篇
  1997年   256篇
  1996年   271篇
  1995年   269篇
  1994年   255篇
  1993年   246篇
  1992年   383篇
  1991年   392篇
  1990年   348篇
  1989年   329篇
  1988年   359篇
  1987年   319篇
  1986年   388篇
  1985年   378篇
  1984年   295篇
  1983年   283篇
  1982年   217篇
  1981年   203篇
  1980年   174篇
  1979年   252篇
  1978年   145篇
  1977年   120篇
  1976年   103篇
  1975年   108篇
  1974年   139篇
  1973年   95篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
This article examines the effects of negotiation practices, such as coercion and contract formality, on how suppliers and customers perceived the resulting business relationship. We conducted a purchasing negotiation simulation with students in a classroom setting in which participants competed for resources in a mock supply-chain context. The participants were surveyed at key stages of the ongoing negotiation in order to measure their behaviors as a customer–supplier relationship developed. The data were used to test several hypotheses developed from the marketing and purchasing literature. The hypotheses were analyzed using structural equation modeling.
Results demonstrated that the use of coercive techniques by negotiators during negotiation had a negative effect on satisfaction. In addition, the findings showed that, as expected, negotiators entering a negotiation with a cooperative orientation would tend to avoid the use of coercive practices during negotiation. The cooperative orientation also exhibited an unexpected positive effect on the formalization of the design of the contract between the parties. This study contributes to the current knowledge base focusing on the creation of agreements between companies and will, we hope, encourage the integration of suppliers and customers in an operating context within a supply-chain setting.  相似文献   
22.
Technology transfer has generally had little impact on the assistive technology industries serving small, highly fragmented “disability markets.” Persons with disabilities often require specialized, relatively sophisticated technology. Third-party payer reimbursement rates and the low levels of disposable income among disability populations often cap product pricing. Transferring technology to these industry segments therefore poses special challenges. In October 1998, the Rehabilitation Engineering Research Center on Technology Transfer initiated the “Demand-Pull Project on Wheeled Mobility.” Successful transfers resulting from this project demonstrate that a systematic technology transfer process can be successfully applied to industries serving specialized and underserved niche markets.  相似文献   
23.
24.
25.
26.
Prosecution history estoppel generally bars patent infringementunder the doctrine of equivalents when a claim is narrowed byamendment during examination, but the ‘tangential relation’criterion preserves that doctrine when the claim is narrowedin a manner unrelated to the particular equivalent which, itis alleged, infringes the patent.  相似文献   
27.
28.
David Galef 《耶鲁评论》2003,91(3):166-172
  相似文献   
29.
This study aimed to expand the scope of previous research by assessing the effectiveness of soot-removal techniques on glass from petrol-bomb debris using methods of 1% and 2% sodium hydroxide (NaOH) solutions, ultrasonic bath and vacuum suction. Of particular interest were the 1% and 2% NaOH solutions applied to the soot-covered surfaces. Petrol bombs containing petrol or a 50:50 mix of petrol and motor oil were exploded and the debris was collected for analysis. Favourable results were found to varying degrees using each of the soot-removal methods with the 1% and 2% NaOH wash solutions, being the most useful. The 2% NaOH solution also proved successful as a soak to loosen and remove heavy contamination of soot and accelerants without damaging the finger mark beneath. This study also found that recovery of finger marks in blood from beneath soot using the 2% NaOH solution was possible. Finger marks were also applied to glass bottles with plastic adhesive labels, and providing the fire damage is not too great marks were also retrievable. Results from this study lead to the conclusion that the NaOH wash solution is ideally suited for soot removal to reveal latent and blood-contaminated marks both within the laboratory and at crime scenes.  相似文献   
30.
The lungs of 79 children who had died between the ages of 1 week and 2 years old were histologically examined. 59 of these children could be categorized as cases of Sudden Infant Death because of the history and postmortem findings. In the remaining 20 cases a definite cause of death could be established. This is the same collective on which the histological investigations of the lymphatic tissue has been carried out. Morphological changes which are typical for a virus pneumonia were found in a substantially higher frequency in the cases of Sudden Infant Death than in the control cases. The validity of these findings and their possible significance for the cause of death are discussed.  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