首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   8210篇
  免费   295篇
各国政治   325篇
工人农民   307篇
世界政治   641篇
外交国际关系   293篇
法律   5465篇
中国政治   47篇
政治理论   1389篇
综合类   38篇
  2021年   57篇
  2020年   133篇
  2019年   163篇
  2018年   201篇
  2017年   224篇
  2016年   220篇
  2015年   153篇
  2014年   216篇
  2013年   824篇
  2012年   219篇
  2011年   229篇
  2010年   186篇
  2009年   182篇
  2008年   221篇
  2007年   242篇
  2006年   252篇
  2005年   208篇
  2004年   217篇
  2003年   233篇
  2002年   182篇
  2001年   330篇
  2000年   319篇
  1999年   228篇
  1998年   93篇
  1997年   73篇
  1996年   79篇
  1995年   74篇
  1994年   86篇
  1993年   68篇
  1992年   148篇
  1991年   160篇
  1990年   141篇
  1989年   157篇
  1988年   140篇
  1987年   155篇
  1986年   136篇
  1985年   154篇
  1984年   120篇
  1983年   142篇
  1982年   97篇
  1981年   93篇
  1980年   73篇
  1979年   104篇
  1978年   79篇
  1977年   67篇
  1976年   57篇
  1975年   47篇
  1974年   57篇
  1973年   66篇
  1971年   58篇
排序方式: 共有8505条查询结果,搜索用时 15 毫秒
981.
982.
The acetabulum/pubis index was tested on American Eskimo and Indian samples of innominate bones to which sex had been assigned by visual inspection. The index alone sexed 91 and 89% of the Eskimo and Indian samples, respectively. Subsequent sorting of misclassified specimens with femur head diameter resulted in 96 and 99% rates of classification. The index and a measurement of ischial height were used in a discriminant function model which correctly identified the sex of 93% of the Eskimo and 92% of the Indian bones. Using femur head diameter to sort those specimens which were misclassified by their discriminant function score yielded classification rates of 96 and 98%. These results are compared to a range of 92 to 100% obtained with the index in earlier studies of American black and white pelvic bone samples.  相似文献   
983.
984.
He is co-author of The American Presidency,and editor of The Politics of Interests.He has written extensively on term limits and rotation in office and related topics and commentaries.  相似文献   
985.
Abstract: Recent case-law of the Court of Justice on general interest exceptions to the free provision of services has indicated a flexible approach to general interest exceptions involving moral or ethical issues. In contrast, where the general interest exception is relied on in a case which demonstrates predominantly economic issues, it is subject to strict scrutiny, in particular, with reference to the principle of proportionality. The article analyses the Court's case-law and tries to deduce the criteria which now govern the Court's position. It also highlights difficulties which this two-tier approach may excite. The position of the Court of Justice reflects the lack of homogeneous European ethical and moral standards, but it also underlines the predominantly economic character of European integration to date. It is submitted, nevertheless, that divorcing the economic criteria for integration from general ethical considerations will prove an extremely difficult, if not fruitless, task.  相似文献   
986.
This paper updates tests of the validity of three models of medical price inflation: a standard model, in which changes in demand press against inelastic supply; a dynamic version of the standard model, in which high levels of insurance induce high rates of product innovation and development; and a model of increasing inefficiency, in which consumers have weak incentives to search out efficient suppliers. Earlier statistical support for the third model has weakened, which provides some evidence that the regulatory and competitive initiatives of the last decade are having their intended effects. But time series measures of medical prices upon which the statistical evidence relies have important methodological problems, so other types of evidence are useful. Trends in expenditure in other countries and in HMOs suggest that the most important explanation of medical price inflation is the dynamic version of the standard model, although the other models have some validity as well.  相似文献   
987.
Second surgical opinion programs (SSOPs) have been used since 1972 by both public and private insurers to improve the patient's information and decision processes and to reduce operative risks and costs attributable to questionable and perhaps unnecessary operations. This article reviews the literature on SSOPs. It considers whether SSOPs are effective mechanisms for reducing health care costs, how SSOPs affect outcomes, how physician errors affect the value of SSOPs, and what nonconfirmation rates and rates of surgery indicate about the appropriateness of operations. Although the literature varies in quality, all the studies fall short in one or more of the following dimensions: an appropriate control group, a comprehensive definition of cost and outcomes, and sufficient duration and scale to measure changes and use of medical services in a general population. Thus, the value of SSOPs remains an open question.  相似文献   
988.
Presented is a case of murder by means of chloroquine, committed on a 36-year-old male. The wife of the deceased had confessed to have secretely administered chloroquine-containing tablets to her husband. She was lawfully sentenced to life-imprisonment. The toxicological findings of this case are compared to the results of two chloroquine suicide cases and discussed in the context of the referring literature. An additional case where chloroquine intoxication was doubtful is introduced because of the unusual circumstances under which it occurred.  相似文献   
989.
990.
Supravital electrical excitability of muscles   总被引:1,自引:0,他引:1  
A new method of postmortem electrical stimulation of muscles, measuring the force of the reaction against time, is presented. Preliminary investigations have yielded the following results: The maximum force of reaction in response to a definitive stimulation, measured by a sensitive force transducer, decreases in proportion to the post mortem interval. Using this method, the mechanical reactions of muscles by electrical stimulation can be demonstrated over a much longer postmortem period as these movements are visible. The duration of postmortem reaction of different muscles seems to be much more uniform than was previously assumed. Occasionally, reactions of the M. orbicularis oculi can be seen for the longest time. The basal muscular tonus changes relative to time. The time course of a single force reaction also changes relative to the postmortal interval: the reaction becomes slower. It has been theoretically established that measurement of influencing factors such as temperature and pH in the tested muscle will enable the time of death to be more precisely estimated.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号