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   27592篇
  免费   883篇
  国内免费   5篇
各国政治   1185篇
工人农民   1083篇
世界政治   1947篇
外交国际关系   959篇
法律   17381篇
中国共产党   6篇
中国政治   223篇
政治理论   5437篇
综合类   259篇
  2020年   356篇
  2019年   433篇
  2018年   554篇
  2017年   634篇
  2016年   650篇
  2015年   479篇
  2014年   525篇
  2013年   2675篇
  2012年   704篇
  2011年   760篇
  2010年   643篇
  2009年   654篇
  2008年   748篇
  2007年   822篇
  2006年   821篇
  2005年   720篇
  2004年   701篇
  2003年   771篇
  2002年   668篇
  2001年   1046篇
  2000年   887篇
  1999年   766篇
  1998年   401篇
  1997年   305篇
  1996年   325篇
  1995年   296篇
  1994年   328篇
  1993年   322篇
  1992年   518篇
  1991年   587篇
  1990年   553篇
  1989年   510篇
  1988年   532篇
  1987年   523篇
  1986年   545篇
  1985年   528篇
  1984年   446篇
  1983年   456篇
  1982年   340篇
  1981年   353篇
  1980年   266篇
  1979年   334篇
  1978年   249篇
  1977年   218篇
  1976年   201篇
  1975年   215篇
  1974年   237篇
  1973年   198篇
  1972年   182篇
  1971年   166篇
排序方式: 共有10000条查询结果,搜索用时 55 毫秒
181.
182.
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   
183.
184.
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   
185.
186.
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   
187.
The purpose of this investigation was to identify inmate personal and demographic data that may be used to further define or profile persons with a greater likelihood of being at risk for serving a jail sentence. This study was explorative. The survey administration was similar in format to that conducted by the U.S. Department of Justice. Chaplains were used as survey proctors. Pilot studies were conducted to determine the suitability of survey content. Surveys consisted of 172 items. Subjects included four hundred inmates: males comprised 88.75 percent of the sample, Caucasians 58.25 percent, Blacks 37 percent, Hispanics 3.25 percent and other 1.5 percent of the sample. Respondents ranged in age from 15 to 64 years with an average age of 30.3 years. Less than two percent of the contacted inmates refused participation in the survey. Results are presented for demographic data, select legal/criminal data, select drug and alcohol use data, employment data, health, parent/family data, education data, social data, and “other”.  相似文献   
188.
189.
190.
The conflict and animosity that sometimes accompanies child custody disputes can give rise to the propagation of allegations of child sexual abuse. To characterize the magnitude of the problem, the present study attempted to determine whether and to what extent child sexual abuse allegations predominate in family court litigation. The entire one-year caseload of a county family court docket was systematically reviewed and coded. Methodical evaluation of 603 family court files yielded base rates of pertinent allegations and other information profiling the cases. The findings did not support the contention that sexual abuse allegations are commonplace in child custody disputes. Sexual abuse allegations were made in 2% of cases in which custody or access was contested and in only 0.8% of the cases overal. Implications of the findings for future research were discussed.The authors gratefully acknowledge the assistance of the Honorable William R. Campbell and Barbara Scott, Clerk of Court for the South Carolina Fifth Judicial Circuit, as well as the contributions of Angie Newton, Frank Robinson, and Kimberly Ellis in the data collection process.  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