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   2749篇
  免费   41篇
各国政治   160篇
工人农民   20篇
世界政治   295篇
外交国际关系   440篇
法律   1376篇
中国共产党   76篇
中国政治   218篇
政治理论   128篇
综合类   77篇
  2021年   27篇
  2018年   22篇
  2017年   13篇
  2016年   16篇
  2015年   20篇
  2014年   113篇
  2013年   28篇
  2012年   166篇
  2011年   133篇
  2010年   78篇
  2009年   90篇
  2008年   140篇
  2007年   186篇
  2006年   158篇
  2005年   137篇
  2004年   110篇
  2003年   120篇
  2002年   102篇
  2001年   76篇
  2000年   103篇
  1999年   32篇
  1998年   18篇
  1997年   16篇
  1996年   17篇
  1994年   42篇
  1993年   19篇
  1992年   18篇
  1991年   28篇
  1990年   23篇
  1989年   27篇
  1988年   108篇
  1987年   21篇
  1986年   28篇
  1985年   29篇
  1984年   29篇
  1983年   23篇
  1982年   22篇
  1981年   35篇
  1980年   32篇
  1979年   30篇
  1978年   15篇
  1977年   42篇
  1976年   33篇
  1975年   12篇
  1964年   28篇
  1963年   24篇
  1962年   40篇
  1961年   18篇
  1960年   22篇
  1959年   29篇
排序方式: 共有2790条查询结果,搜索用时 15 毫秒
91.
科赛奇B_5病毒和猪水泡病病毒的纯化悬液是经过收获和细胞团块病毒的纯化制备的。用纯化的N和H抗原级份(完整颗粒和中空颗粒)进行交叉免疫电泳。曾计算了三株猪水泡病病毒(UKG 72、HK 71和Italy 66)和二株科赛奇B_5病毒(Faulkner和8068)N抗原级份的相对迁移速度(RMV)。科赛奇B_5病毒的标准株(Faulkner)具有与最先分离到的猪水泡病病毒株Italy 66几乎一致的低相对迁移速度。一株科赛奇B_5最近分离株(8068,1973在英国分离到的)具有与1972年在英国分离到的猪水泡病病毒UKG 72株十分近似的比较高的相对迁移速度。同样,猪水泡病病毒香港毒株(HK 71)也具有高相对迁移速度值。最后讨论了这些观察结果与猪水泡病的出现之间的联系。  相似文献   
92.
在所有养骆驼的国家,锥虫感染都引起严重的发病率(达30%)和死亡率(约3%),其中最重要的是苏拉病,即伊氏锥虫(Trypanosoma evansi)感染。这是Evans氏于1880年在印度首先发现和研究的。在非洲,Cazalbou氏早在1896年也曾在马里的Timbuktu地方研究过此病。在苏联,由柯雅二氏锥虫T.ninae kohl—yakimov)在双峰驼所致的锥虫病称作“Su—auru”,这是一个哈萨克名称,意思是“来源于水的疾病”。锥虫病是乍得的骆驼  相似文献   
93.
94.
The relation between timing of first sex and later delinquency was examined using a genetically informed sample of 534 same-sex twin pairs from the National Longitudinal Study of Adolescent Health, who were assessed at three time points over a 7-year interval. Genetic and environmental differences between families were found to account for the association between earlier age at first sex and increases in delinquency. After controlling for these genetic and environmental confounds using a quasi-experimental design, earlier age at first sex predicted lower levels of delinquency in early adulthood. The current study is contrasted with previous research with non-genetically informative samples, including Armour and Haynie (2007, Journal of Youth and Adolescence, 36, 141–152). Results suggest a more nuanced perspective on the meaning and consequences of adolescent sexuality than is commonly put forth in the literature.
K. Paige HardenEmail:

Kathryn Paige Harden, M.A.   received a B.S. in Psychology from Furman University and is currently a doctoral candidate in Clinical Psychology at the University of Virginia. Her research interests include behavior genetic methodology, as well as the development of child and adolescent externalizing psychopathology. Jane Mendle, M.A.   received a B.A. in Psychology from Amherst College and is currently a doctoral candidate in Clinical Psychology at the University of Virginia. Her research interests include the antecedents of pubertal and sexual development, and the consequences of early puberty for psychological adjustment. She is currently a predoctoral intern at New York Presbyterian Hospital in Manhattan. Jennifer E. Hill, M.A.   received a B.A. in Psychology from Dartmouth University and is currently a graduate student in Clinical Psychology at the University of Virginia. Her research interests include the role of peer relationships in the development of adolescent alcohol use and delinquent behavior. Eric Turkheimer, Ph.D.   received a Ph.D. in Clinical Psychology from the University of Texas. He is a Professor of Psychology and the Director of Clinical Training at the University of Virginia. His research focuses on quantitative issues in behavior genetics, gene–environment interaction in the development of intelligence, and measurement of personality and personality disorders. Robert E. Emery, Ph.D.   received a Ph.D. in Clinical Psychology from the State University of New York at Stony Brook. He is a Professor of Psychology and the Director of the Center for Children, Families, and the Law at University of Virginia. His research focuses on family relationships and children’s mental health, including parental conflict, divorce, child custody, and associated legal and policy issues.  相似文献   
95.
Spatially offset Raman spectroscopy (SORS) is a powerful new technique for the non-invasive detection and identification of concealed substances and drugs. Here, we demonstrate the SORS technique in several scenarios that are relevant to customs screening, postal screening, drug detection and forensics applications. The examples include analysis of a multi-layered postal package to identify a concealed substance; identification of an antibiotic capsule inside its plastic blister pack; analysis of an envelope containing a powder; and identification of a drug dissolved in a clear solvent, contained in a non-transparent plastic bottle. As well as providing practical examples of SORS, the results highlight several considerations regarding the use of SORS in the field, including the advantages of different analysis geometries and the ability to tailor instrument parameters and optics to suit different types of packages and samples. We also discuss the features and benefits of SORS in relation to existing Raman techniques, including confocal microscopy, wide area illumination and the conventional backscattered Raman spectroscopy. The results will contribute to the recognition of SORS as a promising method for the rapid, chemically specific analysis and detection of drugs and pharmaceuticals.  相似文献   
96.
拉美决策者长期以来面临着以下争论:1.通货膨胀政策。拉美的通货膨胀率始终高于世界其他地区。在制定反通货膨胀政策的过程中,决策者面临着两种选择:正统的金融控制或非正统的休克疗法。有效的政策应该是合二为一。2.财政政策。这方面争论的核心是:利率应保持在什么水平上。换言之,实际利率(即名义利率减去通货膨胀率)应该是正还是负?低利率能鼓励投资,从而促进经济增长;  相似文献   
97.
T HIS July marks the 100th anniversary of the founding of the Communist Party of China(CPC),whose first national congress back in 1921 heralded the social revolution that would liberate the Chinese people from feudal,imperialist,and bureaucrat capitalism oppression.Under the lead-ership of the CPC,the People's Republic of China was founded in 1949.Seventy or more years later,with the development of socialism with Chinese characteris-tics,China has reached a medium-high ranking on the human development index,and greatly improved the living conditions of its 1.4 billion people,among other achievements.  相似文献   
98.
“电子政府”和信息系统在美国地方政府管理中的应用   总被引:2,自引:0,他引:2  
信息系统在美国地方政府管理中的应用经历前互联网和互联网两个时期,主要应用于财政管理、人事管理、土地管理、公共安全、市政工程等,改善了这些领域的服务。“地理信息系统”的出现和利用提高了工作效率,并逐渐成为公共管理领域的操作平台与支持决策工具。电子政府是指建立在信息技术上的政府运作过程,是高效率的政府过程。改进政府的运作程序是电子政府的实质所在。网络化和政府网络仅仅是电子政府内容的一部分,电子政府效果量化,这是目前值得研究的两个问题。  相似文献   
99.
<正> 1988年贸易与竞争混合法(下称1988年贸易法)对反倾销和反补贴税法作了广泛的修正,但就大部分而言,这些修正并不重要.然而,其中有一个修正案的适用却值得认真研究.在众多的反倾销和反补贴修正案中,反规避条款可能给反倾销反补贴法律机制——美国进口救济的中流砥柱——注入了润滑剂,甚至强化了这些法律的适  相似文献   
100.
Based on a literature study, several interpretations of the term "hydrocution" are presented and discussed. It is difficult to differentiate between hydrocution and atypical drowning. Therefore, the history, the pathogenetic mechanism and the autopsy findings must be considered to establish a clear diagnosis when assessing a sudden death in the water. Practicable diagnosis criteria are recommended.  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