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   6803篇
  免费   206篇
各国政治   295篇
工人农民   268篇
世界政治   575篇
外交国际关系   344篇
法律   4031篇
中国共产党   1篇
中国政治   53篇
政治理论   1416篇
综合类   26篇
  2023年   32篇
  2021年   45篇
  2020年   96篇
  2019年   137篇
  2018年   169篇
  2017年   172篇
  2016年   180篇
  2015年   107篇
  2014年   154篇
  2013年   742篇
  2012年   173篇
  2011年   203篇
  2010年   159篇
  2009年   175篇
  2008年   203篇
  2007年   180篇
  2006年   176篇
  2005年   167篇
  2004年   195篇
  2003年   164篇
  2002年   126篇
  2001年   330篇
  2000年   301篇
  1999年   213篇
  1998年   96篇
  1997年   95篇
  1996年   65篇
  1995年   63篇
  1994年   56篇
  1993年   55篇
  1992年   131篇
  1991年   153篇
  1990年   148篇
  1989年   136篇
  1988年   120篇
  1987年   132篇
  1986年   105篇
  1985年   107篇
  1984年   103篇
  1983年   91篇
  1982年   65篇
  1981年   77篇
  1980年   41篇
  1979年   76篇
  1978年   47篇
  1975年   42篇
  1974年   53篇
  1973年   54篇
  1972年   42篇
  1971年   34篇
排序方式: 共有7009条查询结果,搜索用时 15 毫秒
11.
12.
Acute myoglobinuria as a fatal complication of heroin addiction   总被引:3,自引:0,他引:3  
A fatal case of myoglobinuria complicating heroin addiction is described. Clinically the patient had no overt symptoms of rhabdomyolysis. Pathologists should be alerted to this rare complication in heroin addicts who die of no apparent cause. The antimyoglobin immunoperoxidase technique is useful in confirming the diagnosis.  相似文献   
13.
14.
This paper reports results of a study based on a nationally representative sample of U.S. youth (N = 11,549) that asked two questions: (1) How does family structure affect the likelihood of adolescent death beyond that of race/ethnicity, sex, socioeconomic status, personal behavior, and other structural factors and (2) under what conditions might appeals for social justice be warranted for relative mortality statuses and for absolute gains in mortality? The study found that marital instability increases the likelihood of dying when controlling for a variety of other factors including class, race/ethnicity, sex, and unemployment rate in area of residence. The author argues that this finding lends support to social justice arguments to redistribute resources in such a way as to ensure the likelihood of absolute gains in mortality. The study also found, however, that race/ethnicity/sex also accounted for the likelihood of dying independently of family structure when controlling for socioeconomic and other factors. The author argues that this finding lends support to social justice arguments to redistribute resources on the basis of relative mortality statuses.  相似文献   
15.
Fibres used in forensic casework suffer from a disadvantage common to other forms of trace evidence--it is not possible to state with absolute certainty that they originate from a specific source. Target fibre studies, population studies and research on 'blocks of colour' have effectively demonstrated the polymorphism of textile fibres (particularly man-made ones) and have shown that when a fibre is believed to have a specific putative source, the chance that it has originated from a different source purely by coincidence is extremely remote. A study by Houck MM (Houck MM, Inter-comparison of unrelated fibre evidence. Forensic Science International 2003; 135: 146-149) has shown that no coincidental matching fibres were recovered from items of clothing examined in 20 unrelated crimes. The study involved over two million comparisons. This work goes a step further, and using the example of blue polyester fibres shows that even within a very narrow segment of the whole general fibre population, many examples of a specific colour/type of man-made fibre taken from random sources can be compared and the chance of any two being the same is very low. These studies should help to show the specificity and value of transferred fibres in providing forensic evidence.  相似文献   
16.
A New Use for Practitioners in Teaching Negotiation   总被引:1,自引:1,他引:0  
This article examines the role that practitioners as guest lecturers have traditionally played in the teaching of negotiation. The authors argue that, as seen from the perspective of student learning, this traditional role has not utilized the practitioner's expertise and experience to an optimal degree. Because of this, they have redesigned the role of the practitioner as guest lecturer in their negotiation course. They describe this new role in some detail. Their goal is to encourage students to understand how and why integrative negotiation techniques can work beyond the classroom in what students call the "real world."  相似文献   
17.
A method has been developed on reverse phase high performance liquid chromatography for simultaneous determination of methyl, ethyl and isopropyl alcohols under refractive index detection using pure water as the mobile phase. A good separation has been achieved between these alcohols. Detector response was linear with a detection limit of 5 mg/100 ml. Recovery studies were performed by adding known amounts of methyl and ethyl alcohols to blood, lung and liver within the range 80–90%. The reproducibility of the results was always >90%. The quantitative distribution of methyl alcohol in postmortem body tissues and fluids has been reported in three cases of poisoning.  相似文献   
18.
Drawing on the strategic surprise, warning-response, and foreign policy literature, this article argues that the September 11 terror attacks should be regarded as a strategic surprise and examines a number of key factors that contributed to vulnerability and inhibited vigilance. Three broad explanatory "cuts" derived from the literature—psychological, bureau-organizational, and agenda-political—are deployed to sift through the rapidly expanding empirical record in an effort to shed light on the processes and contextual factors that left the United States vulnerable to the attacks. The article aims to improve our understanding of generic processes and practices that enhance or detract from vulnerability and vigilance.  相似文献   
19.
Decomposition studies were conducted using two carcasses of domestic pigs, Sus scrofa L., 8.4 kg and 15.1 kg in weight, to determine the effects of carcass size on the rate of decomposition, composition of the arthropod fauna, and succession patterns. A total of 46 arthropod taxa were recovered during this study. No size-related differences were observed between carcasses with respect to composition of the arthropod fauna or patterns of succession. A greater number of arthropods were observed attracted to the 15.1-kg carcass, and the rate of decomposition observed was more rapid for the 15.1-kg carcass than for the 8.4-kg carcass. Internal temperatures of the 8.4-kg carcass were more directly related to external ambient temperatures during the fresh and bloated stages of decomposition. During the decay stage, both carcasses generated internal temperatures significantly above ambient temperatures. Following this stage, internal temperatures fell to approximate ambient temperatures during the postdecay and remains stages.  相似文献   
20.
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