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   25311篇
  免费   1233篇
各国政治   918篇
工人农民   1753篇
世界政治   1332篇
外交国际关系   822篇
法律   16685篇
中国共产党   2篇
中国政治   107篇
政治理论   4830篇
综合类   95篇
  2023年   77篇
  2021年   89篇
  2020年   427篇
  2019年   448篇
  2018年   1756篇
  2017年   1706篇
  2016年   1609篇
  2015年   575篇
  2014年   556篇
  2013年   1853篇
  2012年   653篇
  2011年   1360篇
  2010年   1479篇
  2009年   1109篇
  2008年   1202篇
  2007年   1156篇
  2006年   527篇
  2005年   497篇
  2004年   603篇
  2003年   500篇
  2002年   440篇
  2001年   680篇
  2000年   611篇
  1999年   482篇
  1998年   251篇
  1997年   187篇
  1996年   216篇
  1995年   216篇
  1994年   192篇
  1993年   180篇
  1992年   308篇
  1991年   318篇
  1990年   299篇
  1989年   280篇
  1988年   311篇
  1987年   268篇
  1986年   324篇
  1985年   321篇
  1984年   261篇
  1983年   238篇
  1982年   187篇
  1981年   156篇
  1980年   145篇
  1979年   227篇
  1978年   124篇
  1977年   99篇
  1975年   97篇
  1974年   128篇
  1973年   80篇
  1972年   84篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
132.
133.
134.
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   
135.
136.
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   
137.
The psychological assessment battery is an integral part of the selection process used to select patrol officer applicants. Unlike all other procedures used in the selection process, the psychological assessment has not been adequately validated. The purpose of this study was an attempt to provide validation data for a psychological assessment battery. The battery consisted of the Nelson-Denny, Shipley-Hartford, MMPI, and the Motivational Analysis Test (MAT). Performance measures included various measures of training academy performance and field training performance. A stepwise regression and MANOVA/Discriminant Analysis indicated that the psychological tests did predict performance, although an exact predictive equation could not be developed due to the high intercorrelations between predictor variables. This research was sponsored in part by a grant from the School of Applied Arts and Technology, Southwest Texas State University.  相似文献   
138.
139.
140.
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