全文获取类型
收费全文 | 18005篇 |
免费 | 656篇 |
国内免费 | 5篇 |
专业分类
各国政治 | 777篇 |
工人农民 | 792篇 |
世界政治 | 1216篇 |
外交国际关系 | 668篇 |
法律 | 11278篇 |
中国共产党 | 6篇 |
中国政治 | 162篇 |
政治理论 | 3572篇 |
综合类 | 195篇 |
出版年
2021年 | 105篇 |
2020年 | 282篇 |
2019年 | 332篇 |
2018年 | 402篇 |
2017年 | 490篇 |
2016年 | 480篇 |
2015年 | 352篇 |
2014年 | 363篇 |
2013年 | 1702篇 |
2012年 | 519篇 |
2011年 | 539篇 |
2010年 | 454篇 |
2009年 | 473篇 |
2008年 | 569篇 |
2007年 | 600篇 |
2006年 | 572篇 |
2005年 | 518篇 |
2004年 | 507篇 |
2003年 | 526篇 |
2002年 | 467篇 |
2001年 | 699篇 |
2000年 | 566篇 |
1999年 | 501篇 |
1998年 | 269篇 |
1997年 | 181篇 |
1996年 | 220篇 |
1995年 | 191篇 |
1994年 | 210篇 |
1993年 | 207篇 |
1992年 | 334篇 |
1991年 | 372篇 |
1990年 | 350篇 |
1989年 | 294篇 |
1988年 | 330篇 |
1987年 | 281篇 |
1986年 | 332篇 |
1985年 | 296篇 |
1984年 | 240篇 |
1983年 | 223篇 |
1982年 | 189篇 |
1981年 | 196篇 |
1980年 | 138篇 |
1979年 | 179篇 |
1978年 | 126篇 |
1977年 | 112篇 |
1975年 | 125篇 |
1974年 | 134篇 |
1973年 | 106篇 |
1972年 | 103篇 |
1969年 | 99篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
171.
Technology policies and their effect on technology transfer from defense to civilian industries in Israel from 1967 to 1995 are explored. Defense technology policy is found to drive the growth of the defense industry and to limit defense conversion to commercialization initiatives developed primarily through intra-organizational technology transfer. The case of the Israel Aircraft Industries (IAI) is presented. Also the development of national technology policy in Israel is traced and found wanting. Civilian and defense technology policies are found to be uncoordinated with each other and together are incapable of producing interorganizational technology transfer so as to significantly effect defense conversion on a wide number of economic actors particularly small firms. To achieve a socially effective defense conversion process (in which technologies are transferred from defense firms to many economic actors), the analysis suggests that a national technology policy should be designed and implemented under Prime Minister's leadership. 相似文献
172.
Using merged administrative data from welfare reform evaluations in three states, we estimate the effects of child care subsidy use on the length of time it takes for a welfare applicant to move into substantial employment. Findings show that the use of a child care subsidy during an unemployed or marginally employed spell of welfare receipt is associated with between a 0.6 and 1.7 quarter (or 11% to 34%) reduction in the time to substantial employment in two of the three state samples. The positive influence of subsidy use on transitions to substantial employment is strongest for those welfare applicants with the lowest earnings who are mixing welfare and work prior to subsidy receipt. 相似文献
173.
174.
175.
176.
177.
178.
179.
180.
The purpose of this survey was to determine the methods of analysis being used on gunshot residue (GSR) samples in forensic science laboratories across the United States. In addition, the two general techniques of GSR analysis are compared and contrasted. Problems encountered by analysts using scanning electron microscopy/energy-dispersive X-ray analysis (SEM/EDX) are discussed. 相似文献