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   3643篇
  免费   64篇
各国政治   110篇
工人农民   105篇
世界政治   163篇
外交国际关系   101篇
法律   2765篇
中国政治   19篇
政治理论   393篇
综合类   51篇
  2020年   37篇
  2019年   36篇
  2018年   62篇
  2017年   48篇
  2016年   70篇
  2015年   35篇
  2014年   57篇
  2013年   287篇
  2012年   96篇
  2011年   141篇
  2010年   83篇
  2009年   68篇
  2008年   114篇
  2007年   131篇
  2006年   117篇
  2005年   88篇
  2004年   130篇
  2003年   124篇
  2002年   116篇
  2001年   152篇
  2000年   139篇
  1999年   104篇
  1998年   22篇
  1997年   20篇
  1995年   19篇
  1993年   30篇
  1992年   62篇
  1991年   85篇
  1990年   86篇
  1989年   91篇
  1988年   96篇
  1987年   89篇
  1986年   76篇
  1985年   77篇
  1984年   68篇
  1983年   61篇
  1982年   25篇
  1981年   22篇
  1979年   31篇
  1978年   34篇
  1977年   24篇
  1976年   29篇
  1975年   29篇
  1974年   38篇
  1973年   37篇
  1972年   38篇
  1971年   37篇
  1970年   38篇
  1969年   32篇
  1968年   27篇
排序方式: 共有3707条查询结果,搜索用时 0 毫秒
261.
262.
Prostitute for a good reason: stars and morality in Egypt   总被引:2,自引:0,他引:2  
“Prostitute for a Good Reason. Stars and Morality in Egypt” introduces briefly the history of Egyptian film industry, its current star system and the general evaluation of stars on the artistic and moral level. It examines whether and to what extent Egyptian stars may attain a quasi-mythical power and the kind of moral concepts that are conveyed through them. Hence, it touches on the process of how Egyptian audiences are inclined to read mass-mediated messages. In this context the study refers to the phenomenon of veiling that spread among actresses during the early 1990s and tries to relate it to relevant ideological tensions at work. Consequently, the study investigates the position of actresses, primarily top star Nadia al-Gindi. Her image and film persona seem to indicate a very specific interaction between prevalent ideological and moral concepts of different origins including Islamism and modernism on the one hand and cultural taboos of sexuality and power on the other.  相似文献   
263.
Two species of blow flies (Diptera: Calliphoridae) were reared on tissues from rabbits administered different dosages of morphine. These species, Protophormia terraenovae and Calliphora vicina are among the first wave of insects colonizing a dead body. Two series of 3 rabbits were given dosages of 10, 20, and 40 mg/h of morphine over a 3 h period via ear artery perfusion. A morphine blood level plateau was attained after 1 h of perfusion. Two other rabbits were used as controls. Samples of tissues collected from rabbits using a coelioscopic technique were determined to have morphine concentrations similar to those encountered in human overdoses and were correlated with dosages of morphine administered. All samples from control rabbits were negative for morphine. Larvae and puparia of both species were regularly collected from each rabbit for toxicological analysis. Concentrations of morphine in larvae reared on rabbit carcasses containing morphine were significantly lower than concentrations found in the tissues. There was a decrease in concentration in morphine observed in transition from feeding 3rd instar larva to puparium. A correlation between larval concentration and tissue concentration was found only in feeding 3rd instar larvae.  相似文献   
264.
Medical training in the United States often takes the form of a grueling endurance test in which patients are often those most at risk. This Article discusses sleep deprivation among resident physicians in the United States with an eye towards resolving the problem through legal channels. It analyzes the effects of sleep deprivation on resident physicians, with subsequent discussion of the implications for patient care and medical training. Next, it makes comparisons to medical training in other developed nations, as well as regulations that exist in the airline and trucking industries, where public safety is a principal concern. Furthermore, this Article discusses proposals to mend the dilemmas created by sleep-deprived resident physicians through statutory and regulatory reform, deterrence by way of tort law, and unionization or collective bargaining.  相似文献   
265.
This is another in our series of articles about Canadian legal clinics that provide specialized services to people with HIV/AIDS. Vanessa Gruben describes new trends in legal issues observed by the University of Ottawa Community Legal Clinic since the last article by the Clinic in 1999, as well as other programs and projects undertaken by the Clinic over the last year.  相似文献   
266.
A case of fatal cranial injuries caused by an angle grinder is reported. The scalp lesions were typical of those produced by a cutting disk in a side-slipping movement. On the cranial vault were two bony losses of substance, one of which was deep enough for intracranial penetration of the disk. Signs of deflection of the disk, identical to those found on the scalp, were observed on the external bony table. Because of the circumstances in which the victim was discovered, in particular the damage to the machine which had a broken handle, and the lack of any indication of homicide or suicide, an accident is the most likely hypothesis.  相似文献   
267.
Morphine was detected by immunohistochemistry on sections of third stage larvae of Calliphora vomitoria (Diptera, Calliphoridae) reared on minced beef meat previously treated with morphine hydrochloride. The detection was performed with an avidin-biotin-peroxidase-complex method. Positive specimens showed specific staining of the haemolymph and a more intense immunoreaction in an area located at the limit between exocuticle and endocuticle. These results constitute an evidence of morphine accumulation inside the cuticle of Diptera larvae during their development. During the pupariation, the larval cuticle is transformed into the sclerotized puparium. This study consequently points out the possibilities of analyzing empty pupariae when suitable tissues or living necrophagous insects are absent.  相似文献   
268.
Forensic medical service is constantly updated, which is confirmed by introduction of new modern methods, such as detection of blood or semen with test strips, new modifications of methods for handling bone material, differentiation of blood of the same group within ABO system, identification of blood groups in mixed stains of blood of humans and some animals, use of gel plates, etc. Methodological and information letters have been issued and field seminars are regularly carried for upgrading expert biologists. The overwhelming majority of expert biologists have received specialized education and topical upgrading.  相似文献   
269.
270.
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