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   24702篇
  免费   1406篇
各国政治   1190篇
工人农民   1099篇
世界政治   1792篇
外交国际关系   895篇
法律   16095篇
中国共产党   4篇
中国政治   236篇
政治理论   4623篇
综合类   174篇
  2020年   508篇
  2019年   551篇
  2018年   706篇
  2017年   765篇
  2016年   825篇
  2015年   633篇
  2014年   692篇
  2013年   2706篇
  2012年   667篇
  2011年   776篇
  2010年   708篇
  2009年   735篇
  2008年   695篇
  2007年   677篇
  2006年   693篇
  2005年   585篇
  2004年   604篇
  2003年   547篇
  2002年   529篇
  2001年   938篇
  2000年   838篇
  1999年   698篇
  1998年   360篇
  1997年   267篇
  1996年   294篇
  1995年   272篇
  1994年   263篇
  1993年   264篇
  1992年   435篇
  1991年   429篇
  1990年   415篇
  1989年   385篇
  1988年   445篇
  1987年   395篇
  1986年   446篇
  1985年   438篇
  1984年   373篇
  1983年   359篇
  1982年   261篇
  1981年   216篇
  1980年   214篇
  1979年   300篇
  1978年   189篇
  1977年   150篇
  1976年   136篇
  1975年   148篇
  1974年   167篇
  1973年   123篇
  1972年   127篇
  1971年   116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.
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   
28.
29.
The debate over legalizing same‐sex marriage implicates the question of whether doing so would signal the end—or destruction—of the institution of marriage. The appeal to preserving a millennia‐old tradition of marriage against change fails to reckon with the evolution that has already occurred. Invocations of gender complementarity between parents as essential to child well‐being also conflict with growing recognition in family law that children's best interests can be served by gay and lesbian parents. Canada's path toward same‐sex marriage suggests that impasse need not be inevitable. In the United States, this impasse stems in part from the problem that same‐sex marriage serves as an emblem of everything that threatens marriage.  相似文献   
30.
Acute myoglobinuria as a fatal complication of heroin addiction   总被引:3,自引:0,他引:3  
A fatal case of myoglobinuria complicating heroin addiction is described. Clinically the patient had no overt symptoms of rhabdomyolysis. Pathologists should be alerted to this rare complication in heroin addicts who die of no apparent cause. The antimyoglobin immunoperoxidase technique is useful in confirming the diagnosis.  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