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   78281篇
  免费   3114篇
各国政治   4862篇
工人农民   3136篇
世界政治   6810篇
外交国际关系   4209篇
法律   38533篇
中国共产党   11篇
中国政治   804篇
政治理论   22059篇
综合类   971篇
  2021年   446篇
  2020年   1228篇
  2019年   1597篇
  2018年   1900篇
  2017年   2208篇
  2016年   2416篇
  2015年   1929篇
  2014年   2200篇
  2013年   11199篇
  2012年   1894篇
  2011年   2041篇
  2010年   2011篇
  2009年   2230篇
  2008年   2078篇
  2007年   2107篇
  2006年   2251篇
  2005年   2097篇
  2004年   1993篇
  2003年   1747篇
  2002年   1826篇
  2001年   2129篇
  2000年   1826篇
  1999年   1594篇
  1998年   1250篇
  1997年   1095篇
  1996年   1063篇
  1995年   1024篇
  1994年   1034篇
  1993年   1051篇
  1992年   1195篇
  1991年   1227篇
  1990年   1154篇
  1989年   1141篇
  1988年   1151篇
  1987年   1135篇
  1986年   1184篇
  1985年   1198篇
  1984年   1089篇
  1983年   1089篇
  1982年   947篇
  1981年   890篇
  1980年   711篇
  1979年   816篇
  1978年   645篇
  1977年   571篇
  1976年   525篇
  1975年   463篇
  1974年   487篇
  1973年   467篇
  1972年   401篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
121.
122.
123.
Data on bone tissue fractography are summarized and systematized. Possibilities of a microscopic fractography method in analysis of skeletal bone fractures in order to determine conditions of traumatic exposure were shown. Destruction of bone tissue is considered from the point of view of fragile and tough destruction using as a model solid body with crack at the top of which deformations of detachment, lateral and longitudinal shifts are acting. Morphologic features for different types of destruction were singled out. Use of these features may help to determine character and type of deformation at concrete areas of fracture during all destruction process.  相似文献   
124.
125.
126.
Divorce, although a statistical norm, is a developmental trauma to the children involved. This article looks at the two-camp emotional environment of a divorcing family and its effect on the formation of a child's identity. By examining developmental ages, chosen according to divorce research, the author attempts to show how the interspouse emotional cathexes negatively affect a child's sense of self in ways specific to the child's age at the divorce.  相似文献   
127.
From a conflict resolution perspective, it is clear why the child support guidelines are not going to reduce the adequacy and compliance gaps in child support payment conflicts between parents. As it stands, the conflict over equally sharing child support is destructive rather than positive. The guidelines do not reframe the conflict for the parents, enabling them to believe the interests of children are more important than their own interests to win the child support battle. To transform conflict from destructive to positive, the elements of conflict–expression of the conflict, scarce resources and rewards, and interdependency–must be transformed. It is argued that the guidelines do not transform the conflict but facilitate it. Courts and attorneys are also significant players in the child support conflict.  相似文献   
128.
Production function estimates are provided for Soviet industrial production and gross national product for the period 1950–86. A variety of alternative specifications is tested, including Cobb-Douglas, constant elasticity of substitution and variable elasticity of substitution production functions, and an error correction mechanism is used to investigate the long-run properties of the estimated equation. The structural stability of the estimates is also examined. Constant-returns-to-scale Cobb-Douglas production functions suggest that the rate of total factor productivity growth in the Soviet economy has declined steadily over time, becoming negative sometime in the period between 1970 and 1980. However the extensive statistical tests can doubt on the validity of any production function estimated on Soviet data.  相似文献   
129.
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   
130.
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