全文获取类型
收费全文 | 17200篇 |
免费 | 451篇 |
专业分类
各国政治 | 714篇 |
工人农民 | 663篇 |
世界政治 | 1456篇 |
外交国际关系 | 580篇 |
法律 | 10240篇 |
中国共产党 | 2篇 |
中国政治 | 95篇 |
政治理论 | 3728篇 |
综合类 | 173篇 |
出版年
2020年 | 209篇 |
2019年 | 248篇 |
2018年 | 323篇 |
2017年 | 385篇 |
2016年 | 410篇 |
2015年 | 289篇 |
2014年 | 336篇 |
2013年 | 1658篇 |
2012年 | 417篇 |
2011年 | 450篇 |
2010年 | 351篇 |
2009年 | 382篇 |
2008年 | 449篇 |
2007年 | 473篇 |
2006年 | 443篇 |
2005年 | 397篇 |
2004年 | 394篇 |
2003年 | 421篇 |
2002年 | 376篇 |
2001年 | 676篇 |
2000年 | 615篇 |
1999年 | 505篇 |
1998年 | 285篇 |
1997年 | 243篇 |
1996年 | 205篇 |
1995年 | 213篇 |
1994年 | 246篇 |
1993年 | 218篇 |
1992年 | 336篇 |
1991年 | 373篇 |
1990年 | 327篇 |
1989年 | 345篇 |
1988年 | 325篇 |
1987年 | 336篇 |
1986年 | 338篇 |
1985年 | 330篇 |
1984年 | 285篇 |
1983年 | 316篇 |
1982年 | 256篇 |
1981年 | 242篇 |
1980年 | 180篇 |
1979年 | 248篇 |
1978年 | 165篇 |
1977年 | 145篇 |
1976年 | 132篇 |
1975年 | 122篇 |
1974年 | 136篇 |
1973年 | 117篇 |
1972年 | 113篇 |
1971年 | 94篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
Postmortem examination of a former professional basketball player revealed an abnormal heart, most notably a single coronary artery. The literature on single coronary arteries is briefly reviewed, and the possible mechanism which caused the patient's condition is considered. This case is particularly unusual because of the patient's profession, which is so physically demanding. 相似文献
132.
J B Kempton A Sirignano D H DeGaetano P J Yates W F Rowe 《Journal of forensic sciences》1992,37(6):1534-1540
The fingernail ridge patterns of a pair of identical twins were compared to each other, their parents, and an unrelated subject. The patterns of the twins' nails showed regions of strong similarity but were distinguishable from one another. Fewer similarities were found when comparing the nails to those of the parents and the unrelated control. The twins were shown to be monozygotic by means of DNA profiling. This therefore represents the first demonstration of unique fingernail ridge patterns in subjects shown conclusively to be identical twins. When the fingernail ridge patterns were examined with a scanning electron microscope, the backscattered electron (BEI) images were found to have superior contrast when compared to the secondary electron (SEI) images. 相似文献
133.
134.
135.
136.
Brandon J. Kinne 《国际研究展望》2005,6(1):114-128
This paper applies the poliheuristic theory of foreign policy decision making to non-democratic states. Poliheuristic theory asserts that state leaders assign primary importance to their political survival; however, the meaning of "the political" varies dramatically from country to country. Furthermore, the types of actors who hold leaders politically accountable also vary between countries. Consequently, leaders often pursue vastly different means of ensuring their political survival. The author uses the common distinction between single-party, military, and personalist autocracies to show that apparently arbitrary differences in autocratic leaders' political concerns actually vary in systematic and potentially predictable ways. Because this argument is generalized to non-democratic states as a whole, it has important implications for the ways in which democratic states craft their policies toward autocracies. 相似文献
137.
138.
139.
140.
Large-scale privatization is an unfamiliar area of public policy. The practice and study of property reforms and privatization
needs to include mesolvel phenomena such as laws, regulations, institutions and standard operating procedures. There has been
little comparative analysis of privatization programs around the world. The author argues that analysts should compare the
most immediately relevant institutional environment of the enterprise. Conceptually, this mesolevel system is situated between
the firm and the macroeconomy. This system of action is especially fruitful for cross-national comparisons of privatization
programs because it is at this level that privatization strategies are designed. The problem for Eastern Europe and for less-developed
countries is lack of experience with the relatively light economic regulation that characterizes industrial countries. Government
leaders must also decide how much effort to devote to privatization of state-owned enterprises and how much to fostering private
sector investment in new firms.
Ernest J. Wilson, III is affiliated with the National Security Council, Washington, D.C. 相似文献