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   20172篇
  免费   1309篇
各国政治   880篇
工人农民   966篇
世界政治   1434篇
外交国际关系   713篇
法律   13355篇
中国共产党   2篇
中国政治   149篇
政治理论   3839篇
综合类   143篇
  2023年   100篇
  2021年   119篇
  2020年   465篇
  2019年   514篇
  2018年   659篇
  2017年   677篇
  2016年   747篇
  2015年   581篇
  2014年   639篇
  2013年   2186篇
  2012年   588篇
  2011年   578篇
  2010年   606篇
  2009年   639篇
  2008年   606篇
  2007年   625篇
  2006年   621篇
  2005年   530篇
  2004年   527篇
  2003年   445篇
  2002年   489篇
  2001年   728篇
  2000年   654篇
  1999年   520篇
  1998年   275篇
  1997年   204篇
  1996年   227篇
  1995年   225篇
  1994年   210篇
  1993年   218篇
  1992年   341篇
  1991年   343篇
  1990年   315篇
  1989年   312篇
  1988年   327篇
  1987年   288篇
  1986年   346篇
  1985年   347篇
  1984年   282篇
  1983年   253篇
  1982年   211篇
  1981年   184篇
  1980年   166篇
  1979年   230篇
  1978年   127篇
  1977年   105篇
  1975年   110篇
  1974年   134篇
  1973年   95篇
  1972年   83篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
本文是2006年5月25日在香港大学召开的"中非人力资源开发与合作"学术研讨会的系列论文之一。作者基于贫困的持续性与其各构成要素的相互关联性这一机理,运用比较研究方法,测度和评析尼日利亚与中国的减贫政策及其实施效应,反映了国际学术界对减贫问题的研究动态。诚然,本文仅代表作者的观点。  相似文献   
52.
53.
54.
55.
Offender assessment and classification is becoming an increasingly important part of correctional supervision and intervention. Over the last several decades, several different methods and “generations” of offender classification have emerged. Of most value appear to be third-generation, actuarial, dynamic risk/need assessments. With any new correctional strategy, however, there is a need to investigate the use of these risk/need assessments on offender subgroups in order to inform issues, such as reliability and prevalence of criminogenic risk factors. The present study utilized data that were gathered using the Level of Service Inventory-Revised (LSI-R). Results and comparisons of these assessments were investigated and presented for Native American and non-Native American offenders as well as male and female offenders. Discussion of the results, implications, and recommendations for further research are presented.  相似文献   
56.
57.
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   
58.
Good gas chromatography (GC) separation of molecules is essential for clean gas chromatography/mass spectrometry (GC/MS) confirmation of compounds. The trifluoro derivatives of ephedrine (E) and methamphetamine (MA) coelute on dimethyl silicone capillary columns, such as DB-1, which are most commonly used by chromatographers. Methods are described to separate E and MA to aid GC/MS confirmations of methamphetamine, ephedrine, or both E and MA together, whichever may be present in Enzyme Immunoassay (EIA)-analyzed amphetamine-positive urine samples. The use of the heptafluoro derivatives of E and MA on a DB-1 column, or the trifluoro derivatives of E and MA on a DB-17 column, is suggested for good gas chromatographic separation.  相似文献   
59.
One case of the erroneous administration of deslanoside and high level of drug in antemortem plasma and postmortem specimens has been reported owing to the unusual surrounding circumstances. Deslanoside in antemortem plasma was determined by FPIA and the analysis was done by HPLC in the postmortem tissue samples. The analytical results and methods used in the examinations are discussed in the following paper.  相似文献   
60.
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