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   7064篇
  免费   181篇
各国政治   358篇
工人农民   300篇
世界政治   543篇
外交国际关系   295篇
法律   4298篇
中国政治   55篇
政治理论   1379篇
综合类   17篇
  2022年   38篇
  2021年   57篇
  2020年   103篇
  2019年   140篇
  2018年   199篇
  2017年   183篇
  2016年   190篇
  2015年   129篇
  2014年   171篇
  2013年   805篇
  2012年   254篇
  2011年   235篇
  2010年   168篇
  2009年   184篇
  2008年   214篇
  2007年   224篇
  2006年   178篇
  2005年   162篇
  2004年   189篇
  2003年   150篇
  2002年   134篇
  2001年   329篇
  2000年   303篇
  1999年   210篇
  1998年   89篇
  1997年   85篇
  1996年   63篇
  1995年   61篇
  1994年   51篇
  1993年   41篇
  1992年   127篇
  1991年   143篇
  1990年   136篇
  1989年   130篇
  1988年   114篇
  1987年   127篇
  1986年   102篇
  1985年   97篇
  1984年   101篇
  1983年   91篇
  1982年   64篇
  1981年   75篇
  1980年   35篇
  1979年   77篇
  1978年   48篇
  1975年   37篇
  1974年   49篇
  1973年   54篇
  1972年   39篇
  1971年   34篇
排序方式: 共有7245条查询结果,搜索用时 15 毫秒
881.
Police functions and services are currently based on three implicit basic conceptual units: the person, the process, and the product. Each one of these was the fundamental assumption for one of the three historical models of police science: the Personal Qualities Model, the Community Relations Model, and the Scientific Management Model. Although none of these models has ever been implemented in a pure form, modern police science is implicitly based on their three basic conceptual units which are applied to different but specific areas of police functions and services. However, these conceptual units have never been explicitly reconciled with each other, thus at times resulting in contradictory proposals. A comprehensive theory of police functions and services requires a conceptual framework for explicitly relating the person, the process, and the product. A two-dimensional framework is proposed based on a psychological and a sociological level of analysis.  相似文献   
882.
The feasibility of detecting methamphetamine and its major metabolite, amphetamine, in postmortem tissues over a 2-year period was examined. It is important to determine if the abuse and toxic effects of drugs can be proved from evidence found in decayed, submerged, or stained tissue materials. The blood, urine, liver, skeletal muscle, skin and extremity bones from rabbits given methamphetamine intravenously were kept at room temperature, under 4 different conditions: sealed in a test tube, dried in the open air, submerged in tap water and stained on gauze. Methamphetamine was present in all the samples, with slight change in concentration in case of sealed and air dried tissues. Changes varied in bones kept in water. There were considerable decreases in methamphetamine in blood and urine stains. Despite long term storage, drug abuse and/or toxicity could be determined, in all tissues examined.  相似文献   
883.
884.
Abstract: The Australian diplomatic service receives a fair degree of criticism, some misconceived, but some directed constructively at improving its economy and efficiency. The traditional objectives of Australian overseas representation are not questioned; rather the debate centres on the vast range of choice in the ways in which these broad objectives can be met—on such matters as how elaborately the task of overseas representation should be performed, where, and how large, overseas missions should be, how the diplomatic service should be staffed, and whether the pattern of coordination between the diplomatic service and other parts of the public service is appropriate. The complex issues involved in these areas of debate form part of the background against which the everyday work of the diplomatic service is set. This work includes political and economic reporting, the usual consular business, and “one-off” occasions ranging from the preparation of major bilateral treaties to war or revolution. Language and cultural differences make the carrying out of these tasks more difficult. Recruits to the diplomatic service are usually graduates in their mid-twenties with strong university qualifications, which are supplemented by formal training and by experience in different posts abroad and in Australia. The trend to greater specialization of diplomatic staff suggests a need for closer contact between the foreign service and other parts of the Australian Public Service, universities and the private sector. The past few years have been a period of questioning and criticism in all parts of the public sector, including the diplomatic service. At the same time the role played by the diplomatic service has grown more difficult. It is time that discussion focused on the key question—the need for comprehensive representation of Australia overseas—rather than on those who service this representation.  相似文献   
885.
886.
The Supreme Court and judicial scholars have argued that the demographic composition of grand and petit juries is important. To the extent that composition is a function of the selection system used, this suggests that the method of selecting grand and petit jurors is important. This article tests the link between selection system and composition by comparing the representation of blacks, Mexican-Americans, and women on grand juries selected by commissioners with the same three classes' representation on grand juries selected at random from the voter registration lists. For these jurisdictions, only female representation is consistently higher under random selection procedures.  相似文献   
887.
The antipheromone of the summer fruit tortrix moth,Adoxophyes orana F.v.R. (Lepidoptera, Tortricidae), a mixture oftrans-9 andtrans-11-tetradecenyl acetate in the proportion 9: 1, has been formulated in microcapsules for spraying in a disruption experiment. Three sprays with 2 weeks interval have been applied against the second flight ofA. orana during August and September 1974 in an unsprayed 0.2 hectare plot of an apple orchard. The fact that fewer moths have been caught in the monitoring sex pheromone traps in the treated area indicates that sufficient antipheromone was present in the orchard to cause disruption of the pheromone communication. The lower number of larvae of the next generation found in the treated area provides further support to favourable prospects for this pest control method.
Résumé L'antiphéromone de la tordeuse du pommier,Adoxophyes orana, un mélange de trans-9 et trans-11 tetradecenyl acétate, dans une proportion 9:1, a été formulée en microcapsules en vue d'un essai d'interruption de la reproduction. Pendant le deuxième vol deA. orana en ao?t-septembre, 3 pulvérisations ont été effectuées dans une partie d'un verger de pommiers de 0,2 ha. Dans la z?ne traitée, les captures très réduites dans les pièges à phéromone sexuelle indiquent qu'il y avait assez d'antiphéromone répandue dans le verger pour entra?ner une interruption de la communication entre les sexes. Le fait que le nombre de chenilles de la génération suivante était également diminué dans la parcelle traitée, offre de bonnes perspectives pour cette méthode de lutte.
  相似文献   
888.
889.
890.
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