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   17083篇
  免费   565篇
  国内免费   5篇
各国政治   726篇
工人农民   748篇
世界政治   1134篇
外交国际关系   589篇
法律   10917篇
中国共产党   6篇
中国政治   155篇
政治理论   3196篇
综合类   182篇
  2020年   229篇
  2019年   283篇
  2018年   346篇
  2017年   409篇
  2016年   424篇
  2015年   302篇
  2014年   319篇
  2013年   1607篇
  2012年   463篇
  2011年   501篇
  2010年   426篇
  2009年   440篇
  2008年   524篇
  2007年   575篇
  2006年   540篇
  2005年   483篇
  2004年   480篇
  2003年   514篇
  2002年   447篇
  2001年   681篇
  2000年   563篇
  1999年   487篇
  1998年   252篇
  1997年   175篇
  1996年   208篇
  1995年   177篇
  1994年   205篇
  1993年   201篇
  1992年   329篇
  1991年   356篇
  1990年   343篇
  1989年   291篇
  1988年   326篇
  1987年   276篇
  1986年   328篇
  1985年   289篇
  1984年   234篇
  1983年   225篇
  1982年   178篇
  1981年   193篇
  1980年   136篇
  1979年   177篇
  1978年   125篇
  1977年   113篇
  1976年   103篇
  1975年   127篇
  1974年   136篇
  1973年   107篇
  1972年   106篇
  1969年   98篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
241.
In the summer of 1984, police in Pinellas County, Florida, confiscated six identically colored imported Asian skulls (in a shipping case) from a private citizen. In May 1988, in nearby Hillsborough County, police confiscated a very similar skull from another private citizen, who allegedly had found it in an abandoned house. Aside from slight color differences between the six found in Pinellas County and the one found in Hillsborough County, the skulls are virtually identical in their osteological characteristics and condition and in the vital statistics derived from each. Each skull is as clean and dry as those typically sold by commercial scientific supply outlets in the United States. Each is edentulous (primarily premortem), between approximately 20 and 60 years of age at death, and morphologically Asian. Five of the seven are morphologically male, one is morphologically female, and one is a mosaic with respect to gender-related features. Police, medical examiners, coroners, and forensic anthropologists should be aware of such "souvenir" specimens, in the event that they encounter similar skulls. Discriminant function analyses for race and sex yield considerably conflicting results, which underscores the need for using extreme caution when interpreting forensic science estimates based on such techniques.  相似文献   
242.
The authors developed a method of malathion insecticide determination in the cadaveric material (blood and wall of the stomach) including extraction of 5 ml of blood (5 g of fragmented tissue of stomach wall) by hexan; preparative chromatographic purification of extract on silicagel layer L 5/40 mkm in hexan-diethyl ether system 10:2; Gas-liquid chromatographic investigation on column with 5% SE-30 and 5% XE-60 (Chromatograph "Colour-106" with thermionic detector). This method makes it possible to detect 72-76% of malathion added.  相似文献   
243.
244.
245.
This paper examines the process by which R&D results funded by the Office of Conservation and Renewable Energy (CE) of the US Department of Energy (DOE) have generated commercial applications. It looks at examples of technology-transfer procedures and activitees across three of CE's component offices that correspond to the major energy end-use sectors: transportation, buildings, and industry. On the surface, the conservation programs would appear to have little strategic consistency and, therefore, lack the clear leadership many seek in a technology-transfer program. However, as an alternative to strategic consistency, one may tailor the technology-transfer approach of each program to its unique circumstances. This paper presents case studies of such tailoring, in which the diversity of approaches mirrors the complexity of the energy end-use markets and the private-public interests that must be negotiated to successfully commercialize energy-saving innovations. The paper discusses the lessons learned about the conditions requiring adaptive design and the structures and practices that have been proven effective.  相似文献   
246.
247.
248.
249.
When technology is transferred from one context to another, it is an established principle that innovation must take place. Even though a technology is well situated in one context, it must be adoptively redesigned for another. The sharper the difference in contexts, the greater the adaptation. This paper describes a program to transfer technology among a very diverse group of organizations: contractors to the US Department of Defense (DOD). Specifically, it describes how the technology of electronic communication, including electronic- data interchange (EDI), is being pursued by both the DOD and its supporters.  相似文献   
250.
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