全文获取类型
收费全文 | 506篇 |
免费 | 9篇 |
专业分类
各国政治 | 22篇 |
工人农民 | 2篇 |
世界政治 | 23篇 |
外交国际关系 | 15篇 |
法律 | 409篇 |
中国政治 | 5篇 |
政治理论 | 37篇 |
综合类 | 2篇 |
出版年
2019年 | 5篇 |
2018年 | 7篇 |
2017年 | 9篇 |
2016年 | 6篇 |
2015年 | 4篇 |
2014年 | 9篇 |
2013年 | 23篇 |
2012年 | 6篇 |
2011年 | 9篇 |
2010年 | 6篇 |
2009年 | 11篇 |
2008年 | 9篇 |
2007年 | 15篇 |
2006年 | 15篇 |
2005年 | 18篇 |
2004年 | 8篇 |
2003年 | 14篇 |
2002年 | 10篇 |
2001年 | 31篇 |
2000年 | 20篇 |
1999年 | 21篇 |
1998年 | 5篇 |
1997年 | 12篇 |
1996年 | 3篇 |
1995年 | 8篇 |
1994年 | 3篇 |
1992年 | 8篇 |
1991年 | 11篇 |
1990年 | 12篇 |
1989年 | 17篇 |
1988年 | 16篇 |
1987年 | 9篇 |
1986年 | 16篇 |
1985年 | 16篇 |
1984年 | 12篇 |
1983年 | 4篇 |
1982年 | 3篇 |
1981年 | 15篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1978年 | 7篇 |
1977年 | 8篇 |
1976年 | 4篇 |
1975年 | 10篇 |
1974年 | 12篇 |
1973年 | 11篇 |
1972年 | 3篇 |
1971年 | 4篇 |
1970年 | 3篇 |
1964年 | 2篇 |
排序方式: 共有515条查询结果,搜索用时 4 毫秒
511.
512.
正EVERY time we travel to the countryside for an interview,we gain a new understanding of China that transcends that of large metropolises like Beijing and Shanghai.Fengxian County of Jiangsu Province offered us just that;its steps towards rural transformation and development show what can be done to help the countryside reclaim its dynamism. 相似文献
513.
Infrared imaging has a history of use in the forensic examination of artwork and documents and is investigated here for its wider use in the detection of tattoos on the human body postmortem. Infrared photographic and reflectographic techniques were tested on 18 living individuals, displaying a total of 30 tattoos. It was observed that neither age, sex, age of the tattoo, nor, most significantly, skin color affected the ability to image the tattoos using infrared imaging techniques. Second, a piglet carcass was tattooed and the impact of the decomposition process on the visibility of the tattoos assessed. Changes were recorded for 17 days and decomposition included partial mummification and skin discoloration. Crucially, the discoloration was recorded as greatly affecting the image quality using conventional photography, but was insignificant to the infrared recording of these tattoos. It was concluded that infrared reflectography was beneficial in the investigation into tattoos postmortem. 相似文献
514.
Trade specialization, export productivity and growth in Brazil, China, India, South Africa, and a cross section of countries 总被引:1,自引:0,他引:1
Amelia U. Santos-Paulino 《Economic Change and Restructuring》2011,44(1-2):75-97
The paper analyses the patterns of export productivity and trade specialization profiles in Brazil, China, India and South Africa, and in other economic groupings and regions. Various measures of trade specialization and a time varying export productivity indicator are estimated using highly disaggregated export data. The findings reveal that there are important differences in the export productivity and specialisation patterns across countries and regions. Export productivity??and export sophistication??are in line to that of wealthier and more advance economies. The results further confirm the importance of not just the volume of exports, but the type of specialisation patterns. 相似文献
515.
This paper contributes to measurement of licensing performance of U.S. research institutions by suggesting an approach for identifying time-lags in the licensing process. Licensing is a multi-state process starting with a disclosure, and resulting in intermediate outcomes such as patents, licensing agreements, and licensing income. The time duration among these variables is critical in understanding which investment is responsible for which outcome. This study develops a statistic procedure estimating time-lag coefficients among licensing variables using an unstructured regression model (OLS). The procedure is applied to 46 U.S. academic research institutions using the licensing survey data from 1991 to 2007 by Association of University Technology Manager. The results present individual time-lag relationships between each pair of licensing variables. 相似文献