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   23014篇
  免费   899篇
各国政治   1006篇
工人农民   857篇
世界政治   1848篇
外交国际关系   787篇
法律   14305篇
中国共产党   2篇
中国政治   107篇
政治理论   4796篇
综合类   205篇
  2020年   346篇
  2019年   394篇
  2018年   485篇
  2017年   570篇
  2016年   596篇
  2015年   460篇
  2014年   499篇
  2013年   2333篇
  2012年   538篇
  2011年   575篇
  2010年   514篇
  2009年   573篇
  2008年   578篇
  2007年   600篇
  2006年   571篇
  2005年   533篇
  2004年   545篇
  2003年   532篇
  2002年   498篇
  2001年   899篇
  2000年   809篇
  1999年   685篇
  1998年   365篇
  1997年   302篇
  1996年   269篇
  1995年   274篇
  1994年   315篇
  1993年   295篇
  1992年   457篇
  1991年   485篇
  1990年   432篇
  1989年   471篇
  1988年   417篇
  1987年   453篇
  1986年   434篇
  1985年   444篇
  1984年   366篇
  1983年   403篇
  1982年   319篇
  1981年   304篇
  1980年   223篇
  1979年   335篇
  1978年   231篇
  1977年   191篇
  1976年   175篇
  1975年   161篇
  1974年   182篇
  1973年   163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 31 毫秒
101.
This article argues that, despite environmental issues climbing higher on the political agenda and considerable recent policy activity, rhetoric is not matched by reality in our efforts to manage the Australian environment. We integrate the imperatives emerging from the policy and sustainability literatures and from actual policy, with detailed work on wildlife conservation in Victoria's Central Highlands. Our analysis demonstrates that, rather than undertaking the more intensive policy and 'adaptive management' that is needed, governments are often doing less and may actually be 'taking their hands of their wheel'. Some public policy and administration implications of the emerging policy field of sustainability are illustrated.  相似文献   
102.
103.
104.
Misidentification syndromes have been studied from a variety of perspectives, including phenomenological, biological, and nosological approaches. More recently, misidentification syndromes have been studied from a psychiatric-legal perspective, especially with regards to the problem of dangerousness. Capgras syndrome and other syndromes of misidentification can lead to hostile mood and subsequent physical violence. Little attention has so far been devoted to children as the objects of the psychotic person's misidentification delusion(s). We provide a review of cases from the anglophonic literature that have children as the misidentified objects, add three new cases, and then discuss the relationship between misidentification and potential harm to these children.  相似文献   
105.
A gas chromatographic (GC) fingerprint method, based on the presence or absence of six congeners, was developed for illicit cocaine samples. The fingerprint utilizes the relative abundances of these congeners towards each other, disregarding cocaine as the main constituent, and can be expressed numerically or graphically in the form of pictograms for rapid visual comparison. The method can be applied directly to a solution of the sample in chloroform, without previous workup procedures. More than 70 unrelated samples were analyzed and a great variation was observed in the parameter composition. On the other hand, a remarkable similarity could be seen between related samples. The GC fingerprint method may be considered an important contribution for sample comparison, as is exemplified by a subdivision of the analyzed samples in different categories, based on the number and types of congeners found.  相似文献   
106.
During the past decade the field of psychology of law has changed considerably. Accompanying the growth of research and practice, there has been an increase in offerings of courses in this field. The courses are offered at both undergraduate and graduate levels and cover a wide spectrum of interests. The types of courses currently being offered and the student samples enrolling in the courses are examined. In addition, a review of the major textbooks used in the courses is provided.  相似文献   
107.
The polymerase chain reaction (PCR) method of specific gene amplification was used in casework to synthesize millions of copies of the polymorphic second exon of the human leukocyte antigen (HLA)-DQ alpha (or DQA1) locus from a variety of evidence samples. The HLA-DQ alpha allelic variants in the amplified deoxyribonucleic acid (DNA) were determined in a rapid non-radioactive test by hybridization to sequence-specific oligonucleotide probes in both the dot-blot and reverse dot-blot formats. This genetic typing system has been subjected to blind proficiency testing; the performance of this test in the analysis of experimentally mixed samples was also evaluated. As of August 1990, over 250 cases have been tested and more than 2000 individual evidence (bloodstains, semen stains, individual hairs, bone fragments, and tissue sections) and reference samples have been analyzed. The first 198 of these cases are summarized in this paper; in 65% of the cases with conclusive results a suspect was included, and in 35%, all suspects were excluded. Individual cases as well as some of the general issues relating to forensic science analysis and this genetic typing system are discussed. The high rate of exclusion reported here combined with the ability of PCR to type old evidence samples suggests the relevance of this genetic test for postconviction review; two cases in which the convicted suspect was excluded are discussed.  相似文献   
108.
109.
The impact of research information depends on its ability to change beliefs or policy assumptions within the relevant audiences. As a hybrid of American and British systems, Canada's chosen decision-making structure for policy-making and its legislative framework for health insurance make these audiences unclear and not readily accessible. This factor and historical characteristics of the research community which made them only partially responsive to the values of decisionmakers provide an explanation for the limited past use of research information in Canadian health policy. More recently, improved responsiveness by researchers and an emerging definition of the audiences by legislative policymakers are bringing about a gradual increase in the potential impact of research at the levels of administrative and clinical policy. Because of continuing decision-making constraints on legislative policy, however, impact at this level is predicted to remain diffuse, with only cautious acceptance of the changes in beliefs implied by research.  相似文献   
110.
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