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   75187篇
  免费   2996篇
  国内免费   5篇
各国政治   4479篇
工人农民   3024篇
世界政治   6254篇
外交国际关系   3850篇
法律   37837篇
中国共产党   15篇
中国政治   786篇
政治理论   20989篇
综合类   954篇
  2021年   415篇
  2020年   1170篇
  2019年   1539篇
  2018年   1732篇
  2017年   2043篇
  2016年   2214篇
  2015年   1829篇
  2014年   2096篇
  2013年   10565篇
  2012年   1757篇
  2011年   1965篇
  2010年   1918篇
  2009年   2129篇
  2008年   1966篇
  2007年   1993篇
  2006年   2089篇
  2005年   2000篇
  2004年   1866篇
  2003年   1706篇
  2002年   1719篇
  2001年   1992篇
  2000年   1708篇
  1999年   1514篇
  1998年   1198篇
  1997年   1015篇
  1996年   1000篇
  1995年   977篇
  1994年   990篇
  1993年   1001篇
  1992年   1157篇
  1991年   1213篇
  1990年   1163篇
  1989年   1167篇
  1988年   1167篇
  1987年   1150篇
  1986年   1164篇
  1985年   1233篇
  1984年   1076篇
  1983年   1131篇
  1982年   937篇
  1981年   899篇
  1980年   707篇
  1979年   776篇
  1978年   640篇
  1977年   576篇
  1976年   523篇
  1975年   477篇
  1974年   507篇
  1973年   481篇
  1972年   420篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
201.
North American research on the policing of ‘domestic violence’ has been very influential among policy makers in Great Britain. In particular, research which purports to verify the deterrence value of arrest has prompted the establishment of over thirty domestic violence units in London and similar initiatives elsewhere in Britain. The paper will outline the nature of the traditional police response to ‘family violence’ in London and the nature of the experimental innovations. Changes in police practice with regard to this type of violence will be put in the context of the organizational constraints and possibilities of policing. Finally, changing police responses to domestic violence will be evaluated in terms of the debate over the possibility of using the state or its organs to achieve social change.  相似文献   
202.
In recent years, legislators in all fifty states have given grandparents rights to petition for visitation privileges with grandchildren that can be enforced over parental objections. Grandparent visitation rights reflect an effort to protect meaningful relationships children enjoy with nonparental caregivers, enlist the assistance of extended family when the child's nuclear family is disrupted, and defend the interests of grandparents themselves. This psycholegal analysis explores the direct and indirect consequences of grandparent visitation statutes for family functioning. Statutory provisions are summarized, and the effects of these statutes are evaluated in light of what is known about the role of grandparents in child development, how courts evaluate children's "best interests" in grandparent visitation disputes, and how these statutes can alter family functioning in informal ways. The authors conclude that there are risks as well as benefits to children and families in grandparent visitation statutes, and suggest directions for procedural and statutory reform.  相似文献   
203.
Kornai's thesis that shortage results from demand expansions bred by the soft budget constraint, derives from his implicit assumption that price regimes of input and output firms are different. Since any firm is both an input and an output firm, which discards the assumption as logically untenable, excess demand can only turn up because of lower than contracted inputs of labor and management that are not offset by an adequate downward adjustment of earnings. Expansions of demand that appear to be autonomous, are incited by uncertain deliveries of inputs, that is, by inefficiency (of output firms) as well. A by far the largest part of excess demand can be explained by state preferences for fast growth. As planners are more successful in generating investment, and the ensuing consumer, demand than in expanding production, shortage is inevitable regardless of the character of the firms' budget constraints.  相似文献   
204.
A simple and sensitive method is described for quantitative analysis of chlorpromazine in blood, serum, urine and tissue homogenate. The chlorpromazine cation radical produced by adding perchloric acid and 2,3-dichloro-5,6-dicyano-p-benzoquinone to the sample can be detected by the ESR method at room temperature. The sensitivity limit is 10 ng, that is, 20 μl of the solution containing 0.5 μg chlorpromazine/ml. The time needed for the measurement is within 10 min. The chlorpromazine radical thus produced is very stable; for example, 95% of the radical was observed after 24 h. The advantage of this method is discussed by comparing with the ordinary spectrophotometry which requires the purification of the sample.  相似文献   
205.
206.
207.
208.
209.
The remains of an unidentified female neonate were discovered in a field in central Missouri. Examination revealed bilateral absence of the parietal bones. A search of the literature describing similar defects suggests that the present case represents a unique condition, described here for the first time.  相似文献   
210.
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