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   23015篇
  免费   838篇
各国政治   1006篇
工人农民   850篇
世界政治   1847篇
外交国际关系   799篇
法律   14238篇
中国共产党   2篇
中国政治   110篇
政治理论   4788篇
综合类   213篇
  2020年   348篇
  2019年   391篇
  2018年   479篇
  2017年   560篇
  2016年   595篇
  2015年   459篇
  2014年   496篇
  2013年   2327篇
  2012年   534篇
  2011年   570篇
  2010年   510篇
  2009年   567篇
  2008年   574篇
  2007年   597篇
  2006年   574篇
  2005年   523篇
  2004年   542篇
  2003年   532篇
  2002年   492篇
  2001年   898篇
  2000年   811篇
  1999年   683篇
  1998年   364篇
  1997年   301篇
  1996年   268篇
  1995年   278篇
  1994年   315篇
  1993年   295篇
  1992年   456篇
  1991年   484篇
  1990年   437篇
  1989年   472篇
  1988年   417篇
  1987年   453篇
  1986年   433篇
  1985年   444篇
  1984年   367篇
  1983年   402篇
  1982年   318篇
  1981年   303篇
  1980年   223篇
  1979年   335篇
  1978年   230篇
  1977年   194篇
  1976年   177篇
  1975年   162篇
  1974年   182篇
  1973年   162篇
  1972年   147篇
  1971年   121篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
A minisatellite probe, MZ 1.3, detecting hypervariable fragment patterns was isolated from a human genomic library. A repetitive sequence of 27 bp length was identified which is contained in the probe approx. 40 times. The MZ 1.3 repeat shows variable homology of 53-73% to the repetitive sequence of the protein III gene of the bacteriophage M13 genome. Polymorphic restriction fragment patterns were found with MZ 1.3 using the enzymes Hinf I, BstN I, Hae III, Mbo I, PstI/Pvu II, and Rsa I. An average of 18 polymorphic fragments was observed using Hinf I as enzyme. The band sharing frequency after Hinf I digestion among unrelated individuals was determined to be 23.8 +/- 7.2%. An example for the application of MZ 1.3 to paternity testing in an incest case is given. The probe can be used with radioactive or non-radioactive detection systems. An approach is presented to compare polymorphic fragment patterns from individuals obtained by independent gel runs on the basis of relative band positions (RBP) and calculated in a computerized analysis.  相似文献   
63.
64.
65.
This article discusses relevant literature on the potential benefits of sport, recreation, and leisure, and how these benefits relate to rehabilitation of juveniles. Many professionals involved in juvenile rehabilitation believe sport and recreation are beneficial adjuncts to treatment programming; however, it can be difficult to structure sport and recreation in ways that directly correspond to treatment goals. The purpose of this article is to provide insights for professionals working with juveniles on how sport and recreation programming can be an effective means of helping to achieve rehabilitation goals. Attention is given to approaches, particularly the Teaching Games for Understanding model (Bunker & Thorpe, 1982), which can be used to effectively link recreation and sport to the rehabilitation process.  相似文献   
66.
67.
The enzyme activity of phosphoglucomutase (PGM) has been investigated in red cell haemolysates from 142 individuals and compared to the sub-type as determined by isoelectric focusing. The 10 phenotypes showed significant differences in PGM-activity which indicates that there is a correlation between the level of activity and the isolelectric point of homozygotes. No indication of silent alleles or alleles with reduced activity was found in this collective.  相似文献   
68.
69.
70.
The formation of adequate mental health systems within prisons has accelerated as a result of successful class action lawsuits. Our recent national survey questioned all state correctional departments about the existence of standards in each system, compliance with such standards, prevalence of class action lawsuits involving the issue of providing adequate mental health services for inmates, issues related to consent decrees, available mental health resources within the correctional system, and the administrative structure of the mental health system. Our purpose was to identify those factors correlated with certified class action lawsuits involving issues related to mental health services. Twenty-one states were involved in such litigation. Only the presence of psychiatric hospitals operated by the department of corrections correlated with the presence of certified class action lawsuits involving mental health services. Prison systems larger than 15,000 inmates were at higher risk for such litigation. Smaller systems having psychiatric hospitals run by the state mental health agency appeared to be at less risk for such litigation.  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