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   18936篇
  免费   621篇
  国内免费   5篇
各国政治   829篇
工人农民   818篇
世界政治   1389篇
外交国际关系   690篇
法律   11610篇
中国共产党   6篇
中国政治   169篇
政治理论   3860篇
综合类   191篇
  2020年   261篇
  2019年   328篇
  2018年   412篇
  2017年   477篇
  2016年   473篇
  2015年   359篇
  2014年   388篇
  2013年   1945篇
  2012年   519篇
  2011年   578篇
  2010年   453篇
  2009年   505篇
  2008年   557篇
  2007年   632篇
  2006年   604篇
  2005年   545篇
  2004年   541篇
  2003年   575篇
  2002年   488篇
  2001年   713篇
  2000年   588篇
  1999年   520篇
  1998年   288篇
  1997年   213篇
  1996年   237篇
  1995年   212篇
  1994年   230篇
  1993年   224篇
  1992年   354篇
  1991年   375篇
  1990年   373篇
  1989年   301篇
  1988年   353篇
  1987年   309篇
  1986年   338篇
  1985年   314篇
  1984年   256篇
  1983年   240篇
  1982年   186篇
  1981年   208篇
  1980年   143篇
  1979年   181篇
  1978年   135篇
  1977年   118篇
  1976年   107篇
  1975年   135篇
  1974年   137篇
  1973年   116篇
  1972年   102篇
  1969年   101篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
Based on interviews with facility managers in the electroplating and chemical industries, this study examines regulated firms’ perceptions of how various instrumental, normative, and social factors motivated their firms’ environmental actions. We found that “implicit general deterrence” (the overall effect of sustained inspection and enforcement activity) was far more important than either specific or general deterrence, and that deterrence in any form was of far greater concern to small and medium‐sized enterprises than it was to large ones. Most reputation‐sensitive firms in the environmentally sensitive chemical industry chose to go substantially beyond compliance for reasons that related to risk management and to the perceived need to protect their social license to operate. Almost half our respondents also provided normative explanations for why they complied. Overall, we conclude that there are various, often interwoven, strands that must be taken into account in understanding what motivates corporate environmental behavior, and how they play out depends very much on the size and sophistication of companies themselves and on the characteristics of the industry sector within which they are located.  相似文献   
32.
This article explores the consequences for the native population of the Colombian Chocó of the emergence, over the course of the eighteenth century, of an elite of caciques and indios mandones or principales whose functions of powers far exceeded those of the warrior chiefs that had traditionally acted as leaders of their people. Appointed for the purpose of facilitating the collection of tribute and the supply of labour to European settlers, caciques and mandones were almost universally rejected by native communities during the early phases of Spanish colonisation (c. 1630–1690), and they disappear from the historical record after Independence. Eighteenth‐century sources, however, not only record the existence of a clearly defined elite of mandones or principales in villages across the region, but show these individuals engaging actively with the colonial authorities, on behalf of their communities, at local and audiencia levels. This article argues that, at a time of a much strengthened European presence in the region, caciques and mandones came to understand their roles in ways that were entirely different from those intended by the Spanish, and in so doing acquired the legitimacy that had eluded their seventeenth‐century predecessors. Far from serving merely as intermediaries between settlers and indigenous populations, indios mandones acted as negotiators on behalf of the indigenous population, whose task was to defend and/or advance the interests of the communities they had been appointed to control.  相似文献   
33.
Prior studies of recidivism have focused almost exclusively on individual‐level characteristics of offenders and their offenses to explore the correlates of reoffending. Notably absent from these studies are measures reflecting the neighborhood contexts in which individuals live. The current research addresses this shortcoming. Using data on a sample of ex‐offenders in Multnomah County, Oregon (Portland and surrounding area) in conjunction with 2000 census data, we answer two questions. First, which individual‐level factors influence rates of recidivism? Second, to what extent does neighborhood socioeconomic status account for variation in the reoffending behavior of ex‐prisoners that is not explained by their individual‐level characteristics? We find that those who return to disadvantaged neighborhoods recidivate at a greater rate while those who return to resource rich or affluent communities recidivate at a lesser rate, controlling for individual‐level factors.  相似文献   
34.
35.
A fatality following ingestion of the drug baclofen (Lioresal) is described. Baclofen was identified in urine by gas chromatography/mass spectrometry. After derivatization with trinitrobenzene sulfonic acid, baclofen was quantitated in serum and urine by high-performance liquid chromatography. The concentration of baclofen was 17 mg/L in serum and 760 mg/L in urine collected approximately 12 h after the overdose. To our knowledge, this is only the second reported fatality involving a baclofen overdose. The previous case did not include quantitation of baclofen in any biological fluid.  相似文献   
36.
We use data from 1983 and 1985 on the volume of Medicare physician services to analyze whether Medicare's Prospective Payment System (PPS), which resulted in a significant decline in hospital spending, led to a partially offsetting increase in real expenditures for physician services. We also analyze the effect of increases in assignment rates, increasing incomes of the elderly, and other factors on real expenditures during this period. Our main conclusion is that PPS has at most a small positive effect on real physician expenditures. Because people spent less time in the hospital, Medicare physician spending declined; but because of incentives to shift radiology and other services out of the hospital, some of this decline was offset. We also conclude that the sharp increase in Medicare assignment rates over this period, along with the rising incomes of the elderly during this period, contributed to the observed growth.  相似文献   
37.
38.
39.
We investigated the differences in the levels of carboxyhemoglobin (COHb), cyanide (HCN) and petroleum fuels (gasoline and kerosene) between left and right ventricular bloods from fire victims. COHb was slightly, and HCN and petroleum fuels were markedly higher levels in the left than those in the right. These effects were so called 'first pass phenomena' due to the circulation, diffusion and metabolization before the deaths of fire victims.  相似文献   
40.
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