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   13970篇
  免费   459篇
各国政治   843篇
工人农民   577篇
世界政治   1113篇
外交国际关系   554篇
法律   8087篇
中国共产党   3篇
中国政治   170篇
政治理论   2956篇
综合类   126篇
  2020年   204篇
  2019年   217篇
  2018年   298篇
  2017年   335篇
  2016年   333篇
  2015年   301篇
  2014年   301篇
  2013年   1659篇
  2012年   364篇
  2011年   448篇
  2010年   346篇
  2009年   343篇
  2008年   375篇
  2007年   364篇
  2006年   358篇
  2005年   328篇
  2004年   353篇
  2003年   360篇
  2002年   278篇
  2001年   522篇
  2000年   490篇
  1999年   414篇
  1998年   220篇
  1997年   164篇
  1996年   159篇
  1995年   160篇
  1994年   159篇
  1993年   157篇
  1992年   249篇
  1991年   240篇
  1990年   250篇
  1989年   232篇
  1988年   243篇
  1987年   235篇
  1986年   257篇
  1985年   251篇
  1984年   224篇
  1983年   225篇
  1982年   145篇
  1981年   112篇
  1980年   122篇
  1979年   143篇
  1978年   131篇
  1977年   98篇
  1976年   101篇
  1975年   102篇
  1974年   106篇
  1973年   98篇
  1972年   94篇
  1969年   94篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
The attention paid by the social work profession to ethical issues has waxed and waned since the formal inauguration of the profession in the late 19th century. For the first half century of the profession's life, relatively little attention was devoted to problems of professional ethics, though social work's literature was filled with discussions of value-laden issues that arise in practice. In recent years, interest in professional ethics has increased substantially. This article discusses the growth of interest in professional ethics, the formulation of the social work code of ethics, the adjudication of grievances in social work, and the strengths and limitations of the profession's code.  相似文献   
142.
143.
144.
Fifty-three clusters of blowfly eggs of the genus Calliphora vicina were observed in the laboratory up to the hatching stage under reproducible and virtually field-like conditions. Rearing the larvae was then continued up to pupation, the larval growth in length being recorded several times a day. As the object was to study the dependence of the larvae increase in length on the temperature conditions in vitro, the substratal humidity and food supply were kept unchanged during the entire study. The temperature ranged from 6.5 degrees C to 35 degrees C, with the temperature for the individual cluster kept constant during the entire developmental process. Data on about 5500 measured larvae were statistically evaluated. The basic result established was that in the case of the blowfly of the genus Calliphora vicina in vivo, all developmental stages relevant to the entomologic determination of the time of death depend on the temperature conditions: (1) the duration of the egg stage increases with decreasing temperature; (2) the speed of larval growth is slower at lower temperatures; (3) the maximal larval length is reached earlier at higher temperatures; (4) the mean value of maximal length decreases with increasing temperature; (5) larvae under all temperature conditions decrease in size after having reached their maximal length, the decrease in length being more rapid at higher temperatures; (6) constant temperatures over 30 degrees C lead to "stunted forms" which do not pupate and die; (7) constant temperatures under approximately 16 degrees C after the peak of growth has been reached inhibit the readiness to pupate, which causes the larvae to fall into a stationary state of rest, which will be interrupted only when the temperature is raised and resumption of the metamorphosis is thus induced. To allow rapid reconstruction of the larval age in general practice, the established growth data were set out in the form of a diagram designated isomegalendiagram, which permits temperature-fluctuation-related entomologic determination of the time of death with a maximum degree of accuracy.  相似文献   
145.
A split-ballot experiment shows that, when people are asked how interested they are in following political campaigns, their response depends not only on the order in which the question is asked, but also on the broader electoral context in which it is posed. When asked how interested they were in following the political campaigns immediatelyafter a question about whether or not they voted in the (1982) election, people were more likely to think they were interested in the campaign, especially if they claimed to have voted, than if they were asked about it immediatelybefore the question on whether or not they voted. This order effect, however, appears to depend onwhen the questions are asked. If asked within a few weeks after the election, there is little or no order effect. But later, as the memory of the campaign fades, the order of the questions makes a sizable difference in the results. This order effect also seems to be more pronounced among better-educated respondents, suggesting that they are more likely to feel pressured by a social norm to vote and to express an interest in political affairs, not only in real life, but in the survey interview as well. The paper concludes with a brief discussion of the implications for the design of the interview schedule used in the American National Election Studies.The research reported in this paper was supported by a grant from the National Science Foundation (SES81-11404).  相似文献   
146.
147.
148.
149.
150.
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