全文获取类型
收费全文 | 974篇 |
免费 | 45篇 |
专业分类
各国政治 | 75篇 |
工人农民 | 21篇 |
世界政治 | 115篇 |
外交国际关系 | 81篇 |
法律 | 391篇 |
中国政治 | 6篇 |
政治理论 | 315篇 |
综合类 | 15篇 |
出版年
2023年 | 6篇 |
2022年 | 5篇 |
2021年 | 11篇 |
2020年 | 18篇 |
2019年 | 29篇 |
2018年 | 39篇 |
2017年 | 49篇 |
2016年 | 33篇 |
2015年 | 22篇 |
2014年 | 24篇 |
2013年 | 168篇 |
2012年 | 19篇 |
2011年 | 35篇 |
2010年 | 22篇 |
2009年 | 30篇 |
2008年 | 44篇 |
2007年 | 38篇 |
2006年 | 41篇 |
2005年 | 22篇 |
2004年 | 24篇 |
2003年 | 15篇 |
2002年 | 16篇 |
2001年 | 15篇 |
2000年 | 18篇 |
1999年 | 10篇 |
1998年 | 19篇 |
1997年 | 13篇 |
1996年 | 16篇 |
1995年 | 10篇 |
1994年 | 10篇 |
1993年 | 10篇 |
1992年 | 12篇 |
1991年 | 15篇 |
1990年 | 12篇 |
1989年 | 6篇 |
1988年 | 10篇 |
1987年 | 15篇 |
1986年 | 13篇 |
1985年 | 13篇 |
1984年 | 12篇 |
1983年 | 5篇 |
1982年 | 10篇 |
1981年 | 6篇 |
1980年 | 8篇 |
1979年 | 11篇 |
1978年 | 8篇 |
1977年 | 7篇 |
1976年 | 6篇 |
1973年 | 4篇 |
1967年 | 4篇 |
排序方式: 共有1019条查询结果,搜索用时 0 毫秒
131.
Yellowstone National Park and the surrounding mountainous region comprise the Greater Yellowstone Ecosystem (GYE), a 19 million acre area that is one of the few relatively intact ecosystems in the lower 48 states. Conservationists believe that continuation of present land management practices in the region will disrupt the ecological integrity of the GYE. Many authors have identified and described these threats, but as yet there has been no sustained effort to make sense of these threats in the context of the ongoing dynamic policy debate. We develop the foundation for such understanding by examining the implicit problem definitions that have emerged from this debate. They fall into three general categories: 1) a scientific definition, 2) an economic definition, and 3) a bureaucratic definition. This process produces an exploratory definition of the policy problem, which suggests a strategy for better understanding and policy design. We propose several intervention points at which substantive, one-the-ground improvements in the management of the GYE are possible. 相似文献
132.
An earlier registered trade mark may serve to oppose a laterapplication to register a Community trade mark, notwithstandingthat the earlier mark is not used in the form in which it isregistered, so long as the actual use had not destroyed thedistinctive character of the earlier mark. 相似文献
133.
Tarek Belal Tamer Awad Jack DeRuiter C. Randall Clark 《Forensic Science International Supplement Series》2008,178(1):61-82
A series of side chain regioisomers of 3-methoxy-4-methyl- and 4-methoxy-4-methyl-phenethylamines have mass spectra essentially equivalent to the controlled drug substance 3,4-methylenedioxymethamphetamine (3,4-MDMA), all have molecular weight of 193 and major fragment ions in their electron ionization mass spectra at m/z 58 and 135/136. The acetyl, propionyl and trifluoroacetyl derivatives of the primary and secondary regioisomeric amines were prepared and evaluated in GC–MS studies. The mass spectra for these derivatives were significantly individualized and the resulting unique fragment ions allowed for specific side chain identification. The trifluoroacetyl derivatives provided more fragment ions for molecular individualization among these regioisomeric substances. These trifluoroacetyl derivatives showed excellent resolution on a non-polar stationary phase such as Rtx-1. 相似文献
134.
A group of four illegal aliens had been without food for several days when they found a group of wild mushrooms growing in a field in Southern California. Each man consumed a meal of one to six fried mushrooms. Two days after eating the mushrooms, all four men developed abdominal pain, nausea, diarrhea, and intractable vomiting. Three days after consuming the mushrooms, all four were hospitalized and their clinical courses rapidly deteriorated to refractory hepatorenal failure and coma. Three of the victims died three days after admission to the hospital and the fourth died eight days after admission. The autopsy findings are presented and the mechanism of Amanita phalloides mushroom poisoning is discussed. 相似文献
135.
136.
Law and Human Behavior - Three laboratory experiments were conducted to compare legal (unquantified) definitions of three standards of proof (“preponderance of the evidence,”... 相似文献
137.
138.
139.
K J O'Connell H A Frazier M A Clark P J Christenson B T Keyes A Josselson 《Journal of forensic sciences》1988,33(2):410-417
An animal model was designed to evaluate the ability of the standard military flak jacket to protect the kidneys from direct ballistic trauma. Yorkshire swine were anesthetized and their flanks were protected by flak jackets. Ballistic insults ranging from a low-velocity handgun to a high-velocity rifle were evaluated. The results demonstrate that a flak jacket provides adequate protection against low- and mid-velocity projectiles since none of the animals from this group had evidence of internal trauma and because only minor superficial surgical attention would have been required. Survivability in each case was considered to be excellent. The flak jacket failed to provide any protection against several types of high-velocity bullets. These weapons caused severe internal injury to the genitourinary system as well as to other major organ systems. Survival would have been unlikely. 相似文献
140.
Roger S. Clark 《Criminal Law Forum》1993,4(3):471-502
B.A., Victoria University of Wellington 1964; LL.B., Victoria University of Wellington 1964; LL.M., Victoria University of Wellington 1967; LL.M., Columbia University 1968; J.S.D., Columbia University 1972. Professor Clark was a member of the former United Nations Committee on Crime Prevention and Control and represented New Zealand as an observer at the first two meetings of the United Nations Commission on Crime Prevention and Criminal Justice. Any views expressed here are his own.See generally Roger S. Clark,United Nations Crime Prevention and Criminal Justice Program: Formulation of Standards and Efforts at Their Implementation (forthcoming 1994). 相似文献