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   594篇
  免费   33篇
各国政治   62篇
工人农民   47篇
世界政治   61篇
外交国际关系   31篇
法律   217篇
中国政治   8篇
政治理论   180篇
综合类   21篇
  2023年   4篇
  2022年   5篇
  2021年   6篇
  2020年   8篇
  2019年   14篇
  2018年   16篇
  2017年   22篇
  2016年   19篇
  2015年   19篇
  2014年   15篇
  2013年   129篇
  2012年   14篇
  2011年   19篇
  2010年   13篇
  2009年   16篇
  2008年   26篇
  2007年   14篇
  2006年   12篇
  2005年   15篇
  2004年   16篇
  2003年   19篇
  2002年   16篇
  2001年   14篇
  2000年   6篇
  1999年   13篇
  1998年   10篇
  1997年   12篇
  1996年   7篇
  1995年   7篇
  1994年   6篇
  1993年   5篇
  1992年   7篇
  1991年   8篇
  1990年   3篇
  1989年   13篇
  1988年   8篇
  1987年   6篇
  1986年   10篇
  1985年   4篇
  1984年   7篇
  1983年   4篇
  1982年   3篇
  1981年   4篇
  1980年   6篇
  1979年   6篇
  1977年   3篇
  1976年   3篇
  1974年   3篇
  1971年   2篇
  1970年   3篇
排序方式: 共有627条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
75.
VICTORIA     
The Victorian Liberal Premier, Richard Hamer, in adjourning the 1980 parliamentary session with the traditional “Christmas felicitations”, made special reference to the record number of sitting days and the longer daily average of sitting hours achieved. Labor Opposition Leader Frank Wilkes in turn drew attention to the total of 126 bills introduced during the spring session, of which 101 had been instigated by the government and 25 by private members. Such an arduous and concentrated parliamentary schedule has obvious policy implications, but also prompts a query about its administrative consequences. To what extent was the mass of legislation dealt with by the last Victorian State parliament directed towards administrative ends as well as to the Liberal government's more obvious political goals?  相似文献   
76.
La notion de frontière est au c?ur d’une ambivalence entre son caractère délimitateur, son rôle de contour spatial et la contestation des séparations qu’elle opère. La frontière juridico-politique, limite de systèmes, est soumise à de profonds bouleversements. Dès lors, elle fait l’objet d’une nouvelle acception et devient le lieu d’une coopération entre des acteurs soucieux d’un développement harmonieux et d’un retour à la normalité au bénéfice d’une nouvelle dimension de l’espace: le transfrontalier. Comment le droit a t-il accueilli ces évolutions? Quelle définition s’impose au juriste devant la notion de frontière?  相似文献   
77.
78.
This paper evaluates the short-run benefits of research and development (R&D) projects funded by the Automotive Lightweighting Materials (ALM) Program of the Office of FreedomCAR and Vehicle Technologies of the U.S. Department of Energy (DOE). The six ALM projects evaluated—using qualitative and quantitative evaluation methods—yielded numerous benefits in the short-run. From the qualitative assessment, all met their technical goals, increased intellectual knowledge among the research teams, and led to increased collaboration among DOE, the auto industry, its suppliers, and national laboratories. Moreover, U.S. competitiveness appeared to have increased as a result of each R&D effort. One interesting finding, however, is that most of the participants indicated their firms would not have engaged in the research efforts without DOE funding. If they had engaged in the effort, it would have been with considerably less person time and financial commitment. With respect to quantitative measures, several graduate students were supported by the projects and numerous publications and presentations resulted, although these metrics varied across the ALM R&D projects.  相似文献   
79.
Acute promyelocytic leukemia (APL) is a subtype of acute myelogenous leukemia frequently associated with clotting abnormalities and severe hemorrhagic diathesis. The disease is associated with a high incidence of early fatal hemorrhage. We report the sudden death of a 40-year-old male without significant medical history in which foul play had been initially suspected. A thorough postmortem investigation performed on the decedent lead to the diagnosis of APL. Cause of death was a cerebellar hematoma. Underlying APL should be considered in the differential diagnosis when unexplained bleeding is encountered in a decedent. This case emphasizes the value of routinely collecting bone marrow during an autopsy to enable accurate testing and diagnosis.  相似文献   
80.
Traditional methods of volatile detection used by police typically consist of reliance on canine olfaction. However, dogs have some limitations such as cost of training and time of conditioning. The possibility of using parasitic wasps for detecting explosives and narcotics has been developed. Moreover, wasps are cheap to produce and can be conditioned with impressive speed for a specific chemical detection task. We examined the ability of Nasonia vitripennis Walker to learn and respond to methyldisulfanylmethane (DMDS), a volatile discriminator of cadaver. The training aimed to form an association between an unconditioned stimulus (pupae) and the conditioned stimulus (odor source). After the training, the time spent by conditioned wasps in the DMDS chamber was measured. Statistical analysis showed that the increasing concentrations involved an increase in the time spent in the chamber containing DMDS. This study indicates that N. vitripennis can respond to DMDS, which provide further support for its development as a biological sensor.  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