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   7098篇
  免费   234篇
各国政治   300篇
工人农民   272篇
世界政治   534篇
外交国际关系   335篇
法律   4144篇
中国政治   42篇
政治理论   1661篇
综合类   44篇
  2023年   51篇
  2020年   88篇
  2019年   112篇
  2018年   159篇
  2017年   164篇
  2016年   185篇
  2015年   118篇
  2014年   134篇
  2013年   793篇
  2012年   150篇
  2011年   191篇
  2010年   146篇
  2009年   180篇
  2008年   182篇
  2007年   174篇
  2006年   194篇
  2005年   148篇
  2004年   182篇
  2003年   178篇
  2002年   152篇
  2001年   257篇
  2000年   247篇
  1999年   187篇
  1998年   115篇
  1997年   99篇
  1996年   87篇
  1995年   105篇
  1994年   96篇
  1993年   97篇
  1992年   150篇
  1991年   139篇
  1990年   168篇
  1989年   162篇
  1988年   175篇
  1987年   167篇
  1986年   138篇
  1985年   141篇
  1984年   118篇
  1983年   100篇
  1982年   88篇
  1981年   68篇
  1980年   61篇
  1979年   61篇
  1978年   63篇
  1977年   45篇
  1976年   49篇
  1975年   42篇
  1974年   65篇
  1973年   44篇
  1970年   37篇
排序方式: 共有7332条查询结果,搜索用时 250 毫秒
901.
902.
903.
The issues involved in deciding whose preferences are to be counted in cost-benefit analysis are often misunderstood or controversial. This paper attempts to resolve the issues in a number of particular cases by looking to the fundamental value assumptions underlying cost-benefit analysis. Cost-benefit analysis is useful only to the extent that there exists a general consensus that the value assumptions are legitimate. Certain implications of the value assumptions prove useful in deciding what preferences have standing.  相似文献   
904.
905.
906.
907.
In continuation of previous light microscope investigations the question has been raised whether the criteria determined for vital muscle damage using light microscopy, could be verified and perhaps extended for the ultrastructural region. In addition to existing human pathological material taken early post mortem, muscle tissue obtained from animal experiments was also examined. The evaluation concentrated on the muscle cells, the cell organelles and the contractile apparatus. An evaluation of semi-thin-sections was carried out in parallel. The following reaction patterns could be defined as vital reactions: hypercontraction bands, zones of rupture in narrow topological relationship to organelle changes, microstructure changes with disintegration of the fibre structure, subsarcolemmic and interfibrillary oedema, decomposition of the sarcolemma. The earliest vital reactions were detectable after only a few minutes survival time. The comparison between the results of animal experiments and human pathology and the application of the results to forensic pathology will be discussed.  相似文献   
908.
Most trial attorneys believe that repeated jury service produces several effects in jurors, one of the most important of which is an increased disposition toward conviction of criminal defendants. However, case law reveals a reluctance to accept the proposition that prior service per se would disquality a juror from sitting on an instant case because of actual or implied bias. The need for direct empirical investigation of the effects of prior jury service prompted the present study, which examined a complete docket of 175 consecutive criminal trials across onecalendar year in a state circuit court which required a 30-day term of its venire. The results indicated that as the number of jurors with prior jury experience increased there was a modest, but significant, increase in the probability of a conviction. Analysis of the relationship between initial verdicts and subsequent service disconfirmed the alternative hypothesis that attorneys deselected jurors on the basis of their first verdicts. Several parameters of experience were also related to foreperson selection. Implications for legal practice and for additional research are discussed.Support for this research was provided, in part, by National Science, Foundation grant No SES-8209479. A portion of this work was conducted while the senior author was a James McKeen Cattell Foundation Fellow.  相似文献   
909.
A simple and rapid method for isolation of five butyrophenones with Sep-Pak C18 cartridges from human samples, and their wide-bore capillary gas chromatography (GC), are presented. The GC was made by both flame ionization and electron capture detections. The drugs contained in alkaline samples were directly applied to the cartridges and eluted with chloroform/isopropanol (9:1). The recoveries with use of the cartridges were excellent for most drugs in both urine and plasma samples. We can recommend the Sep-Pak C18 cartridges for isolation of butyrophenones because of simplicity and rapidity, and also wide-bore capillary GC because of high sensitivity and low decomposition of drugs during passage through the column.  相似文献   
910.
Proceeding on the assumptions that the day of the week is the best predictor of the levels of calls for police service, that calls for police service emanate from the pursuit of routine activities, and that weather influences routine activities, this paper examines how the expected change in the level of calls for service for a particular day of the week in Chicago is altered with the arrival and passage of weather fronts. Fronts taking 1 day to pass Chicago have a broader effect on the changes in calls across the days of the week than fronts taking 2 days in passage. On the whole, the 2-day fronts significantly alter calls for service during the weekdays but not on the weekend, while 1-day fronts significantly alter calls on both weekdays and weekends. In general, cold fronts decrease calls for service, and warm fronts increase calls for service.  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