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   15308篇
  免费   446篇
各国政治   670篇
工人农民   624篇
世界政治   960篇
外交国际关系   472篇
法律   9895篇
中国共产党   3篇
中国政治   101篇
政治理论   2919篇
综合类   110篇
  2020年   193篇
  2019年   245篇
  2018年   329篇
  2017年   368篇
  2016年   363篇
  2015年   252篇
  2014年   302篇
  2013年   1562篇
  2012年   375篇
  2011年   397篇
  2010年   338篇
  2009年   352篇
  2008年   417篇
  2007年   416篇
  2006年   457篇
  2005年   385篇
  2004年   393篇
  2003年   385篇
  2002年   360篇
  2001年   535篇
  2000年   517篇
  1999年   388篇
  1998年   197篇
  1997年   188篇
  1996年   181篇
  1995年   162篇
  1994年   169篇
  1993年   168篇
  1992年   314篇
  1991年   330篇
  1990年   299篇
  1989年   316篇
  1988年   282篇
  1987年   315篇
  1986年   297篇
  1985年   299篇
  1984年   267篇
  1983年   292篇
  1982年   186篇
  1981年   181篇
  1980年   143篇
  1979年   195篇
  1978年   146篇
  1977年   130篇
  1976年   114篇
  1975年   100篇
  1974年   117篇
  1973年   127篇
  1972年   102篇
  1970年   90篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
72.
73.
74.
A case of fatal self-poisoning with dextromethorphan, an antitussive, and terfanadine, an antihistamine H1, is reported. Both drugs were quantified in several postmortem tissues and fluids using capillary gas chromatography coupled to mass spectrometry. Results are discussed in the light of the existing literature.  相似文献   
75.
In order to cooperate with voluntary screening programs aimed at the surveillance of the HIV epidemic in Finland, we have studied medicolegal autopsies for HIV antibodies since 1986 using an enzyme immunoassay on postmortem sera. The investigation covered 47.4% and 39.2%, respectively, of all deaths under the age of 65 years in the metropolitan areas of Helsinki and Turku--two cities on the densely populated southern coast of Finland from which most HIV infections have thus far been detected. Nine HIV-positive cases (0.12%) were detected among the 7305 medicolegal autopsies tested in 1986 to 1990. This figure is higher than the prevalence of 0.01 to 0.03% in voluntary screening programs for the general population would suggest. Seven of our cases had previously tested positive, and two were previously unknown cases, indicating that people at high risk are clustered in the medicolegal autopsy series. Of the six cases in an early stage of infection, three committed suicide suggesting the importance of HIV-screening in suicide cases in tracing symptomless HIV carriers. Five of the cases were detected in 1990, a year when the number of new HIV infections had more than doubled compared to the previous two years. This suggests that testing of medicolegal autopsies as surrogate tests for the population gives useful information even in low-prevalence areas like Finland. Such testing has none of the ethical problems of many other back-up surveys, and may be particularly sensitive to early changes in epidemiology.  相似文献   
76.
Distinctive blunt force injuries caused by a crescent wrench.   总被引:1,自引:0,他引:1  
  相似文献   
77.
78.
79.
Current research suggests that a husband's substance abuse is correlated with severity of physical abuse and the woman's decision to leave a violent situation. Often, only the battered woman's report of abuse is available. This study compares women's reports of their partners' substance use/abuse with their partners' report using a brief measure of polydrug and alcohol abuse, the Substance Abuse Subtle Screening Inventory (SASSI) and the Conflict Tactics Scale (CTS). Data were analyzed for 25 recovery couples and 25 nonrecovery couples. The correlations for all 50 couples between the male's reported use and the female's report of her partner's use on the SASSI and the CTS were significant on all but one of the CTS scales. They ranged on SASSI from .73 to .33 and from .31 to .06 on the CTS. This suggests that the SASSI and possibly the CTS could be used as valuable tools for assessing women's reports of their partner's substance use/abuse.  相似文献   
80.
Historically, small businesses have been the innovation engine of the United States, with significantly more than half of the new technologies and products coming from small enterprises. In 1992, there were more than 21 million small businesses with fewer than 500 employees each in the United States, including 4.5 million small corporations, 1.6 million partnerships, and 15.1 million sole proprietorships. Although most small businesses have considerably fewer than 100 employees, they employ more than half the private U.S. work force, contribute more than half of all sales in the country, and are responsible for over half of the private sector's products. From 1976 to 1990, small firms also generated 65% of the net new jobs. From 1988 to 1990, all of the net new jobs in the U.S. economy were created by small firms. Indeed, small business is really big business in the United States.  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