全文获取类型
收费全文 | 4468篇 |
免费 | 122篇 |
专业分类
各国政治 | 155篇 |
工人农民 | 153篇 |
世界政治 | 232篇 |
外交国际关系 | 163篇 |
法律 | 3162篇 |
中国政治 | 24篇 |
政治理论 | 659篇 |
综合类 | 42篇 |
出版年
2021年 | 26篇 |
2020年 | 49篇 |
2019年 | 61篇 |
2018年 | 97篇 |
2017年 | 90篇 |
2016年 | 109篇 |
2015年 | 64篇 |
2014年 | 88篇 |
2013年 | 417篇 |
2012年 | 122篇 |
2011年 | 171篇 |
2010年 | 112篇 |
2009年 | 99篇 |
2008年 | 149篇 |
2007年 | 165篇 |
2006年 | 154篇 |
2005年 | 117篇 |
2004年 | 147篇 |
2003年 | 151篇 |
2002年 | 134篇 |
2001年 | 167篇 |
2000年 | 155篇 |
1999年 | 118篇 |
1998年 | 31篇 |
1997年 | 28篇 |
1994年 | 25篇 |
1993年 | 32篇 |
1992年 | 73篇 |
1991年 | 95篇 |
1990年 | 100篇 |
1989年 | 102篇 |
1988年 | 102篇 |
1987年 | 93篇 |
1986年 | 85篇 |
1985年 | 93篇 |
1984年 | 74篇 |
1983年 | 67篇 |
1982年 | 35篇 |
1981年 | 26篇 |
1979年 | 34篇 |
1978年 | 35篇 |
1976年 | 29篇 |
1975年 | 29篇 |
1974年 | 41篇 |
1973年 | 40篇 |
1972年 | 36篇 |
1971年 | 37篇 |
1970年 | 39篇 |
1969年 | 33篇 |
1968年 | 28篇 |
排序方式: 共有4590条查询结果,搜索用时 15 毫秒
911.
A 34 years old man shot himself by a selfmade muzzle-loader. He pluged one end of a waterpipe, used a cylindrical lead shot (Cal. 1.2 cm, length 2.15 cm, mass 22.7 g), special black powder (about 4 g, from fire-crackers; powder with an admixture of aluminium) and kindled the weapon in front of his chest by a slowmatch. He died immediately by retained missile of chest. The weapon flew away like a rocket. Unused projectils and powder (found in the flat) and the uninjured pipe allowed to copy the event. Velocity and energy of shot and weapon were determined, also the recoil of the pipe and the highest force of a hand to hold it fast. Experimental investigations and calculations correspondet well to the findings af the case. 相似文献
912.
913.
The focus of this analysis is an attempt to compare Canadianand American federalism in terms of Samuel Beer's modernizationtheory. In Canada, it is argued that modernization had led tothe enhancement of provincial power rather than the centralizationof the federal system. The Westminster model of parliamentarygovernment contributed to these developments, although the wayin which power is organized in government has been even moreimportant in determining the directions taken by Canadian federalism. 相似文献
914.
915.
Promotion of tobacco products: issues and policy options 总被引:1,自引:0,他引:1
K E Warner V L Ernster J H Holbrook E M Lewit M Pertschuk J L Steinfeld J B Tye E M Whelan 《Journal of health politics, policy and law》1986,11(3):367-392
During the past year, several prominent voluntary health organizations and professional medical associations have called for a ban on all forms of promotion of tobacco products. The proposal raises complex issues, ranging from determination of the effects of tobacco promotion to assessment of the constitutionality of banning advertising of a legal product. We identify the issues that underlie the concern of health professionals, review evidence addressing these issues, and describe and discuss frequently mentioned policy options, especially the ban proposal. 相似文献
916.
917.
918.
919.
920.