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   18026篇
  免费   1280篇
各国政治   744篇
工人农民   861篇
世界政治   1241篇
外交国际关系   590篇
法律   12481篇
中国共产党   2篇
中国政治   116篇
政治理论   3175篇
综合类   96篇
  2023年   86篇
  2021年   90篇
  2020年   449篇
  2019年   468篇
  2018年   608篇
  2017年   632篇
  2016年   696篇
  2015年   532篇
  2014年   565篇
  2013年   1908篇
  2012年   511篇
  2011年   527篇
  2010年   549篇
  2009年   577篇
  2008年   541篇
  2007年   528篇
  2006年   526篇
  2005年   454篇
  2004年   449篇
  2003年   380篇
  2002年   422篇
  2001年   688篇
  2000年   613篇
  1999年   490篇
  1998年   246篇
  1997年   178篇
  1996年   195篇
  1995年   197篇
  1994年   175篇
  1993年   184篇
  1992年   309篇
  1991年   316篇
  1990年   297篇
  1989年   283篇
  1988年   307篇
  1987年   265篇
  1986年   324篇
  1985年   319篇
  1984年   253篇
  1983年   230篇
  1982年   178篇
  1981年   155篇
  1980年   145篇
  1979年   220篇
  1978年   119篇
  1977年   95篇
  1975年   95篇
  1974年   128篇
  1973年   84篇
  1972年   79篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
112.
In this study, a new method was developed for the impurity profiling of illicit MDMA tablets. The extraction efficiency, linearity, repeatability and reproducibility of the method were evaluated. Eighty two MDMA tablets coming from presumed unrelated large seizures in 2004 (n >500 tablets) were analyzed by gas chromatography mass spectrometry (GC-MS) in order to assess the discrimination power of the method. The latter was found to be practical, robust, relatively easy to perform, highly discriminative and yielding good chromatography. In addition, some new impurities were detected and identified. Their chemical structures and mass spectra are reported.  相似文献   
113.
The legislator, in the German Federal Republic, has opted for a specific legal solution in relation to the protection of the embryo. Carola Müller, in this article, describes this regulation as well as the reasons that have led to its adoption. The article finishes with an exposition of the existing social discussion in German society and the effect that the law has had.  相似文献   
114.
More than a decade after NAFTA (North American Free Trade Agreement) entered into force, the environmental effects of agricultural trade liberalization in Mexico are still controversial, emerging, and not fully understood. This paper contributes to the literature that aims to explore trends in input use in the agricultural sector in Mexico during the post-NAFTA period among both commercial/industrial and traditional/rainfed farmers, and examines the influence of the national and multilateral institutional framework on these outcomes. We decompose the post-NAFTA agricultural production data into scale, technique and composition effects to estimate the impact that trade liberalization has had on the use of fertilizer and land use, two key agricultural inputs for which reliable aggregate data is available. We conclude that among commercial farmers patterns of crop type specialization and significant technological improvements have led to some declines in fertilizer use but they have been offset by growth in fertilizer use associated with growing agricultural output. Among traditional farmers increased output and specialization in land-intensive grain crops are contributing to an increase in land under cultivation and technological improvements show the potential, but not yet not the strength, to counteract these effects. We analyse the environmental institutional framework and rural development plans, observing that institutional weaknesses have, in several instances, reduced the environmental benefit of technique and composition effects. We conclude with recommendations about how the Mexican agricultural sector might reap the environmental benefits of international agricultural trade.  相似文献   
115.
The regional disparities in Russia are increasing since transition started in the 1990s, as result of the structural processes of reorganisation and reallocations of resources taking place in the territory. The scopes of this contribution are two folds: to clarify the theoretical and policy background in analysing regional development in the transition and in particular in Russia, and to analyse the specificity of the spatial development and the regional disparities patterns in Russia. The economic geography is recognised among the different theories, very useful for helping to understand in particular the recent phenomena of new concentration pattern in Russia, giving a key of analysis of new polarisation trends: new trends toward urban concentrations in the Western regions, de-population of the Eastern regions, rural decline in those regions faraway from large urban agglomerations. In fact the empirical analysis indicates two dominant phenomena in the up-surging of regional disparities: the increasing weight of the capital city, Moscow as agglomeration effects brings the polarisation phenomena; and the strengthening of the natural resources and energy endowed regions. There is the question whether Russia, at this stage of development, can pursue an active regional policy toward equity targets or whether, for the target of sustaining macro-economic growth, there is the urgency to keep selected priorities based on the best performing poles. A difficult balance between the two targets would be the most suitable answer.  相似文献   
116.
This article reports the results of a study of the antecedents of long-term success in community mediation. Seventy-three mediation sessions were recorded and content analyzed. The participants were interviewed at two points: immediately after mediation and 4 to 8 months later. No relationship was found between the quality of the agreements—i.e., the extent to which they solved immediate problems- and long-term success as measured by compliance, improved relations between the parties, and the absence of new problems. On the other hand, joint problem solving by the disputants was related to complainant perceptions of improved relations with the other party. Also respondent perceptions that the mediation had been fair and that all the problems had come out were related to all aspects of long-term success in the eyes of the complainant. The latter results support a procedural justice analysis of mediation and underline the importance of mediator attention to the respondent.  相似文献   
117.
118.
119.
120.
Despite the recent increase in public and professional interest in the problem of wife beating in Arab society, in Israel, and in the rest of the Arab world, there is a serious lack of empirical research on different dimensions of the problem in those societies. This paper presents the results of a survey conducted among a systematic random sample of 362 Arab husbands from Israel, in an attempt to examine the contribution of patriarchal ideology toward explaining their beliefs about wife beating. Although about 58% of the participants indicated that there is no excuse for a man to beat his wife, 15–62% still justified wife beating on certain occasions (e.g., adultery, failure to obey husbands, disrespect for parents and relatives). In addition, although the participants tended to perceive abusive and violent husbands as responsible for their behavior, 52% still expressed understanding of that behavior and, on some occasions, 23–43% even blamed the wife for violence against her. Regression and multiple regression analyses revealed that over and above the participants' age and level of education, their masculine sex-role stereotypes, negative and traditional attitudes toward women, nonegalitarian marital role expectations, and familial patriarchal beliefs were the most significant predictors of beliefs about wife beating. Implications of the results and limitations of the study are also 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