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   75364篇
  免费   3027篇
各国政治   4568篇
工人农民   3076篇
世界政治   6474篇
外交国际关系   3915篇
法律   37454篇
中国共产党   12篇
中国政治   764篇
政治理论   21189篇
综合类   939篇
  2021年   424篇
  2020年   1185篇
  2019年   1547篇
  2018年   1778篇
  2017年   2082篇
  2016年   2279篇
  2015年   1875篇
  2014年   2131篇
  2013年   10628篇
  2012年   1791篇
  2011年   1960篇
  2010年   1938篇
  2009年   2142篇
  2008年   1952篇
  2007年   1947篇
  2006年   2113篇
  2005年   1997篇
  2004年   1861篇
  2003年   1646篇
  2002年   1730篇
  2001年   2070篇
  2000年   1810篇
  1999年   1544篇
  1998年   1206篇
  1997年   1035篇
  1996年   1029篇
  1995年   989篇
  1994年   1012篇
  1993年   1032篇
  1992年   1145篇
  1991年   1184篇
  1990年   1122篇
  1989年   1171篇
  1988年   1153篇
  1987年   1133篇
  1986年   1182篇
  1985年   1200篇
  1984年   1056篇
  1983年   1072篇
  1982年   932篇
  1981年   891篇
  1980年   710篇
  1979年   805篇
  1978年   624篇
  1977年   562篇
  1976年   509篇
  1975年   439篇
  1974年   478篇
  1973年   465篇
  1972年   404篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
321.
目的 建立用高效薄层色谱法定性及半定量测定人尿中硝西泮的代谢物7-氨基硝西泮(7ANIZ)含量的方法。方法 人口服治疗量10 mg硝西泮后,在pH 9条件下用乙醚进行提取,分析物斑点用氟罗里丝进行荧光显色,紫外灯下(366nm)观察荧光斑点;根据斑点荧光显色情况及强度进行7ANIZ定性及半定量检测。结果 尿中硝西泮代谢物7ANIZ检出限为5 ng/ml,测量限为15 ng/ml。结论 人口服治疗量10 mg硝西泮,用高效薄层色谱法可定性及半定量测定48 h内排泄尿中的7ANIZ。  相似文献   
322.
323.
324.
The study presents a method for the demonstration of esophageal varices at autopsy by gastroesophageal phlebography. The veins visible on the radiographs were controlled and evaluated by studying the gross appearance of sections of the esophagus at the level of the varicose veins and by histologic examination of the sections. The phlebography was found to be useful in estimating the varicose and normal veins of the esophagus. The study indicates further that the degree of varicosity is not always proportional to the severity of cirrhosis of the liver, and there may be varicose esophageal veins in patients with liver or heart disorders without hepatic cirrhosis.  相似文献   
325.
This study examined the nature of police response to domestic violence incidents with a focus on the identification of areas of police intervention that female victims of domestic abuse find “most” helpful and “least” helpful. The first part of the study was based on the analysis of a random sample of incident reports of domestic abuse cases recorded in 2000 and 2001. These reports were examined to obtain information about the characteristics of domestic abuse victims and summary information about the incidents of domestic abuse offenses. The second stage of the research study involved a telephone survey conducted with a random sample of fifty female domestic abuse victims who called the police. The study examined female victims' perceptions of how the police responded to the domestic abuse incidents, how helpful or not so helpful victims found the police to be when they responded to their calls, and how their cases were handled by the legal system.  相似文献   
326.
327.
The purpose of this study was to examine the relationship between job demands, job resources, and burnout, and to examine if burnout could predict both work and health-related outcomes among police officers. The participants were 223 Norwegian police officers, and data were collected using a questionnaire. The study was part of a national survey of both health care and non-health care professions. The overall level of burnout was low among police officers compared to other occupational groups tested in Norway. Both job demands and job resources were related to burnout, especially work-family pressure was an important predictor for all of the three burnout dimensions. Burnout predicted individual outcomes, such as psychosomatic complaints and satisfaction with life, as well as work outcomes, such as job satisfaction, intention to quit, and organizational commitment. Suggestions for potential interventions to reduce burnout and negative individual and organizational consequences are presented.  相似文献   
328.
Although law enforcement agencies across the nation have assumed part of the responsibility in the fight against terrorism, significant confusion exists as to the role of local law enforcement. While some agencies have taken steps towards terrorism prevention, little data has been collected on which agencies have taken the greatest steps, how those agencies have changed, and how other agencies should direct their activity. This case study of law enforcement census data from a single state considered variations in terrorism preparedness and predictors of preparedness. Agency size, presence of funding, and other variables significantly predict levels of terrorism preparedness. Important policy implications such as the distribution of funding and which agencies should be working towards terrorism preparedness are discussed.  相似文献   
329.
330.
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