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   9449篇
  免费   316篇
各国政治   559篇
工人农民   307篇
世界政治   804篇
外交国际关系   424篇
法律   5043篇
中国政治   51篇
政治理论   2435篇
综合类   142篇
  2020年   117篇
  2019年   153篇
  2018年   236篇
  2017年   211篇
  2016年   236篇
  2015年   159篇
  2014年   179篇
  2013年   1159篇
  2012年   234篇
  2011年   253篇
  2010年   214篇
  2009年   230篇
  2008年   248篇
  2007年   266篇
  2006年   249篇
  2005年   253篇
  2004年   236篇
  2003年   231篇
  2002年   228篇
  2001年   287篇
  2000年   246篇
  1999年   214篇
  1998年   145篇
  1997年   136篇
  1996年   118篇
  1995年   117篇
  1994年   112篇
  1993年   115篇
  1992年   158篇
  1991年   194篇
  1990年   172篇
  1989年   182篇
  1988年   160篇
  1987年   167篇
  1986年   161篇
  1985年   171篇
  1984年   157篇
  1983年   158篇
  1982年   126篇
  1981年   131篇
  1980年   116篇
  1979年   107篇
  1978年   89篇
  1977年   69篇
  1976年   73篇
  1975年   73篇
  1974年   80篇
  1973年   74篇
  1972年   59篇
  1969年   58篇
排序方式: 共有9765条查询结果,搜索用时 15 毫秒
31.
32.
A fatality following ingestion of the drug baclofen (Lioresal) is described. Baclofen was identified in urine by gas chromatography/mass spectrometry. After derivatization with trinitrobenzene sulfonic acid, baclofen was quantitated in serum and urine by high-performance liquid chromatography. The concentration of baclofen was 17 mg/L in serum and 760 mg/L in urine collected approximately 12 h after the overdose. To our knowledge, this is only the second reported fatality involving a baclofen overdose. The previous case did not include quantitation of baclofen in any biological fluid.  相似文献   
33.
34.
To account for variance in great powers responses to threats and the implications for the peacefulness of the international system since the late nineteenth century, this article elucidates a theory which refines and synthesizes economic liberal perspectives and realist balance of power theory. I argue that different patterns and levels of economic interdependence in the great power system generate societal-based economic constraints on, or incentives for, state leaders of status quo powers hoping to mobilize economic resources and political support to oppose perceived threats. This mobilization process influences strongly the preferences of status quo powers, other states beliefs about those preferences, and the interpretation of signals in balance of power politics. In this way, economic ties influence the strategies great powers pursue. Firm balancing policies conducive to peace in the international system are most likely, I then hypothesize, when there are extensive economic ties among status quo powers and few or no such links between them and perceived threatening powers. When economic interdependence is not significant between status quo powers or if status quo powers have strong economic links with threatening powers, weaker balancing postures and conciliatory policies by status quo powers, and aggression by aspiring revisionist powers, are more likely. I then illustrate how these hypotheses explain the development of the Franco-Russian alliance of the 1890s and its effectiveness as a deterrent of Germany up to 1905, British ambivalence toward Germany from 1906 to the First World War, the weakness of British, French, Soviet, and American behavior toward Germany in the 1930s and World War II, and the American and European responses to the Soviet threat, including the NATO alliance, and the "long peace" of the post-1945 era.  相似文献   
35.
36.
37.
38.
39.
Correlation between plasma and bone marrow tricyclic antidepressants has not been studied before. Two groups of rabbits were given 10 and 20 mg of desipramine/kg body weight, respectively. Desipramine was administered to the animals once daily by mouth for 5 days. On the fifth day the animals were sacrificed and blood and bone marrow samples were collected and analyzed using a high performance liquid chromatographic (HPLC) method. Data showed that a correlation exists between bone marrow and blood desipramine. The bone marrow desipramine concentration increased as its blood levels increased. The average ratio of bone marrow to blood desipramine +/- S.D. (standard deviation) in both dosage groups was 37.2 +/- 4.46 with a range of 30.99-44.82. This investigation is promising and shows that bone marrow could be used as an alternative tissue in the absence of a suitable blood sample.  相似文献   
40.
The Green River Murder Investigation in King County, Washington, is currently the longest active serial murder investigation in U.S. history. During its course, over 26 separate scenes with from one to five victims each have been processed. The experience of the authors is presented in order to acquaint other agencies with techniques of outdoor scene processing that have evolved during recovery of remains from Green River and other skeletal cases.  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