全文获取类型
收费全文 | 12300篇 |
免费 | 361篇 |
专业分类
各国政治 | 499篇 |
工人农民 | 475篇 |
世界政治 | 896篇 |
外交国际关系 | 384篇 |
法律 | 7500篇 |
中国政治 | 121篇 |
政治理论 | 2687篇 |
综合类 | 99篇 |
出版年
2020年 | 142篇 |
2019年 | 207篇 |
2018年 | 253篇 |
2017年 | 281篇 |
2016年 | 292篇 |
2015年 | 202篇 |
2014年 | 235篇 |
2013年 | 1221篇 |
2012年 | 260篇 |
2011年 | 317篇 |
2010年 | 248篇 |
2009年 | 317篇 |
2008年 | 323篇 |
2007年 | 337篇 |
2006年 | 310篇 |
2005年 | 287篇 |
2004年 | 280篇 |
2003年 | 290篇 |
2002年 | 279篇 |
2001年 | 455篇 |
2000年 | 398篇 |
1999年 | 318篇 |
1998年 | 182篇 |
1997年 | 146篇 |
1996年 | 165篇 |
1995年 | 158篇 |
1994年 | 162篇 |
1993年 | 158篇 |
1992年 | 253篇 |
1991年 | 279篇 |
1990年 | 263篇 |
1989年 | 269篇 |
1988年 | 250篇 |
1987年 | 240篇 |
1986年 | 285篇 |
1985年 | 277篇 |
1984年 | 254篇 |
1983年 | 227篇 |
1982年 | 174篇 |
1981年 | 140篇 |
1980年 | 117篇 |
1979年 | 157篇 |
1978年 | 93篇 |
1977年 | 120篇 |
1976年 | 102篇 |
1975年 | 79篇 |
1974年 | 94篇 |
1973年 | 87篇 |
1972年 | 81篇 |
1971年 | 70篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
111.
Effects of positional restraint on oxygen saturation and heart rate following exercise 总被引:1,自引:0,他引:1
D T Reay J D Howard C L Fligner R J Ward 《The American journal of forensic medicine and pathology》1988,9(1):16-18
This report assesses the effects on peripheral oxygen saturation and heart rate that positional restraint induces when a person is prone, handcuffed, and "hog-tied." Peripheral oxygen saturation and heart rate were monitored at rest, during exercise, and during recovery from exercise for 10 adult subjects. The effects of positional restraint produced a mean recovery time that was significantly prolonged. Consequently, the physiological effects produced by positional restraint should be recognized in deaths where such measures are used. 相似文献
112.
113.
Lobbyists, entrenched forces in congress and self-interested friends will try to stymie Clinton's efforts. A look at four key arenas of combat. 相似文献
114.
115.
116.
Peter Atkins Greg Bagley Jim Bartoo Michael Bayer David Beatty David Brown Terry Cook Reggie Fairchild David Foster Bruno Gentil Gordon Goetzmann Michael Green Jim Hamann Rustom Irani Greg Lee Lynn Little Jim Mariani Tom McGuire Doug Merrill Gentaro Murakami Todd Naiven Taisuke Nomura Doug Paul Joe Rodriguez Stephen Silver Howard Suskind Mitsuhiro Tsuchiya Mike Wais Jeff Wright Jonathan Zaremski 《The Journal of Technology Transfer》1992,17(1):58-67
The United States today faces a loss of influence as a world power, a reduction in American independence as a policymaker, and a decline in the standard of living on which Americans have come to depend. History teaches that nations weaker and less productive than the United States can rise to become economic powerhouses and rapidly increase their standards of living. History also teaches that nations failing to recognize their fundamental problems will inevitably decline. American politicians must face what is abundantly clear: the United States is losing ground and must act quickly to reverse its course. This White Paper outlines what must be done. Information about the nation's current status must be analyzed and communicated. Incentives to improve the level of competence in government must be provided and maintained. The emphasis of government policy must be changed to reflect broad economic and technological interests as opposed to special interests. Savings must be encouraged and increased. Infrastructure must be improved Tax laws must be modified to help bring these changes about. Economic and technological issues must be elevated to the importance they require. American thinking must reflect the new realities: that the age of leadership through military power is over, that the requirements for success in the world of the 1990s and beyond require a sound and growing economy that is internationally competitive. The US can accomplish these goals only through foundation-shaking, comprehensive, fundamental changealong the lines we propose herein.This paper is the executive summary (with minor editing modifications) of a white paper that is available from Cornell University's Johnson Graduate School of Management. 相似文献
117.
118.
Black RF Collins S Boroughs DL Cumming-Bruce N Kahn S Blount J Tarr M Behn S Hall M 《U.S. news & world report》1992,113(4):48-52, 54-9
119.
120.