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   67297篇
  免费   3296篇
各国政治   4507篇
工人农民   2889篇
世界政治   6000篇
外交国际关系   3818篇
法律   30997篇
中国共产党   9篇
中国政治   743篇
政治理论   20680篇
综合类   950篇
  2023年   361篇
  2021年   405篇
  2020年   1159篇
  2019年   1526篇
  2018年   1659篇
  2017年   1954篇
  2016年   2170篇
  2015年   1838篇
  2014年   2109篇
  2013年   10576篇
  2012年   1572篇
  2011年   1670篇
  2010年   1796篇
  2009年   2055篇
  2008年   1717篇
  2007年   1681篇
  2006年   1825篇
  2005年   1720篇
  2004年   1634篇
  2003年   1426篇
  2002年   1474篇
  2001年   1498篇
  2000年   1325篇
  1999年   1173篇
  1998年   1097篇
  1997年   965篇
  1996年   947篇
  1995年   910篇
  1994年   912篇
  1993年   939篇
  1992年   950篇
  1991年   963篇
  1990年   934篇
  1989年   963篇
  1988年   974篇
  1987年   979篇
  1986年   933篇
  1985年   1022篇
  1984年   897篇
  1983年   946篇
  1982年   884篇
  1981年   833篇
  1980年   642篇
  1979年   665篇
  1978年   569篇
  1977年   510篇
  1976年   482篇
  1975年   391篇
  1974年   401篇
  1973年   413篇
排序方式: 共有10000条查询结果,搜索用时 328 毫秒
991.
992.
The abuse of heroin (diacetylmorphine) in Singapore escalated sharply in 1975 and 1976, as indicated by the 35-fold increase in the number of heroin seizures and the 20-fold increase in the urine samples containing morphine since 1974. A rapid and simple GC method has been described to estimate diacetylmorphine (and caffeine). Monoacetylmorphine and acetylcodeine may be ascertained by an additional step involving acetylation. All gas chromatograms of a large number of samples analyzed consistently had the same pattern, indicating that they possibly had a common origin. This GC "fingerprint," together with the quantitative data, appears to be characteristic of the illicit Asian or Chinese type of heroin found in Singapore. The proportions of the four major ingredients in some twelve typical samples have been tabulated. Statistical data confirming the accuracy and reproducibility of the analytical method have also been presented.  相似文献   
993.
Abstract. The efforts to functionally bilingualize the federal public service over the past decade have generally attracted more jeers than cheers. In this rather personal article the author attempts to describe and defend his own role and that of the Public Service Commission in a major attempt at adult re-education.  相似文献   
994.
Abstract. Does management by objectives stifle organizational innovation in the public sector? The authors explore this possibility by describing five common characteristics of mbo and then contrasting them with four characteristics of innovative organizations. The comparison suggests that mbo -pressures lead to organizational stress that is often resolved by the creation of two working environments; one for the pursuit of innovative objectives, and one for the pursuit of regular objectives. This could lead to dysfunctionalism in the form of abandoned objectives-objectives that might have been achieved if mbo were not used. The authors conclude with four implications for public-sector managers: (1) the practice of including innovation objectives along with traditional objectives in the same set of objectives is questionable; (2) broader objectives, perhaps pointing in the general direction of the innovations sought, might be more productive in some cases than specific objectives; (3) possible incompatibility between mbo and innovation might be lessened if innovative ventures are pursued in ad hoc organizational structures; and (4) management by objectives and innovation are not necessarily compatible.  相似文献   
995.
996.
997.
Diversity in communications is most appropriately understood as a free flow of ideas. In order to implement diversity, a comprehensive model of the communication process must be used for policy research, so that the various participants in the process can be properly restrained from abridging the free flow of ideas. The setting of priorities for implementing diversity has been illustrated using available studies of broadcast and cable television.  相似文献   
998.
999.
1000.
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