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   13380篇
  免费   439篇
各国政治   760篇
工人农民   555篇
世界政治   1006篇
外交国际关系   546篇
法律   8039篇
中国共产党   2篇
中国政治   163篇
政治理论   2638篇
综合类   110篇
  2020年   167篇
  2019年   209篇
  2018年   295篇
  2017年   309篇
  2016年   328篇
  2015年   257篇
  2014年   286篇
  2013年   1505篇
  2012年   336篇
  2011年   445篇
  2010年   309篇
  2009年   353篇
  2008年   357篇
  2007年   339篇
  2006年   345篇
  2005年   271篇
  2004年   314篇
  2003年   333篇
  2002年   248篇
  2001年   537篇
  2000年   511篇
  1999年   424篇
  1998年   205篇
  1997年   159篇
  1996年   163篇
  1995年   149篇
  1994年   163篇
  1993年   153篇
  1992年   263篇
  1991年   249篇
  1990年   265篇
  1989年   247篇
  1988年   274篇
  1987年   274篇
  1986年   248篇
  1985年   239篇
  1984年   218篇
  1983年   222篇
  1982年   138篇
  1981年   112篇
  1980年   117篇
  1979年   147篇
  1978年   112篇
  1977年   88篇
  1976年   96篇
  1975年   84篇
  1974年   86篇
  1973年   74篇
  1972年   72篇
  1971年   73篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
871.
A reversible technique is presented in which the root morphology of missing teeth in skeletonized human remains can be reconstructed for the purpose of radiographic comparison and postmortem identification. In this technique, which is based upon pilot studies with skeletonized mandibles of archival remains, the alveolar socket walls are sealed with a coat of cyanoacrylate cement and injected with a mixture of vinyl polysiloxane and barium sulfate. Radiographs are produced with the radiopaque mixture in place, which highlights the antemortem morphology of the roots. Subsequently, the impression material is removed, resulting in no gross alteration of the evidence. The radiographs made with this technique, as well as the impressions, can be stored for later use at a trial or pending the discovery of antemortem dental evidence.  相似文献   
872.
Between 1987 and 1989 there were approximately 5,000 cases of fatal and injury-sustained road traffic accidents, of which 2.3-3.0% were alcohol related (blood alcohol levels greater than the legal limit of 80 mg% ethanol). The offenders of alcohol-related accidents are mostly Chinese (> 79%), male (> 98%), and more often 30-40 years old. The majority of the alcohol-related accidents (> 74%) took place between 8 P.M. and 4 A.M. in fine weather and light traffic. Rear-end, head-on, and side-on collisions comprised > 60% of all the alcohol-related accidents, and losing control of vehicles approximately 30%. Drunken driving cases for the same period that were not accidents showed a number of characteristics similar to those for accidents. In Singapore, motorcycle riders and pedestrians are more prone to road fatality than other road-user groups. International comparisons of road fatalities per 100,000 population gave Singapore one of the lowest accident rates (8.1-8.4) as compared with countries such as Australia, the United Kingdom, the United States, New Zealand, Canada, and Japan.  相似文献   
873.
874.
In the 14-year period from 1976 to 1989, there have been 174 homicide victims in the Auckland colonial area. Data accessed from autopsy and police reports show that victims of marital conflict, family dispute, and arguments developing between nonmarried couples made up the largest proportion of homicide cases. Stabbing and assault with a blunt weapon were the most common causes of death. The data also show that homicide is relatively uncommon in Auckland in comparison with other cities of similar size.  相似文献   
875.
876.
Over the past fifteen years the national government in the Federal Republic of Germany has animated the political debate about rising health care expenditures. However, it has only provided health policy leadership by shifting the burden of financing health and medical care to others. This paper presents three cases that illustrate the political and institutional constraints inherent in the German policy process that limit the proposal and implementation of appropriate policy solutions to rising health care costs. Cost controls have been inhibited because of the near-universal entitlement of national health insurance, the access all social groups have to advanced medical care, and policies targeted at providers rather than users of health services. The paper also underscores the past and future importance of regional policy coalitions in shaping national health policy.  相似文献   
877.
Altogether, 318 preliminary proceedings were initiated against physicians, compared to 2 against nonmedical practitioners. The majority i.e., 192 proceedings, dealt with charges of torture and deprivation of freedom committed against patients under psychiatric treatment. Ninety-nine proceedings were based on negligent bodily injury and negligent homicide and 15 on failure to give medical assistance. Other reasons were given in isolated cases only. The proceedings were mostly initiated against surgeons, psychiatrists, general practitioners, internists, gynecologists, and 2 against nonmedical practitioners (42 because of negligent bodily injury and 48 because of negligent homicide). The charges were dropped in accordance with Section 170,2 StPO in 78 cses, Section 153, 153a and 154 StPO in 7 cases, and there were 7 acquittals and 2 sentences after trial. In the remaining preliminary proceedings, the charges were dropped in 215 cases according to Section 170,2 StPO, and in 2 cases according to Section 153a StPO. Three defendants were sentenced to punishment and 1 received a verdict of not guilty. Thus in most of the preliminary proceedings the charges were dropped.  相似文献   
878.
Transborder data flow and technology transfer issues have a substantial overlap. Transborder data flows represent flows of information with economic and/or cultural value. Electronic access to “know-how”, information, data, etc. is becoming more and more important to technology transfer and sharing. National transborder data flow policies either affect or can themselves be technology transfer policies.  相似文献   
879.
The distribution of Tf phenotypes in the population of Padua was investigated by ultrathin-layer isoelectric focusing. In our sample (n = 618) nine phenotypes, Tf C1, C2, C3, C3?1, C2?1, C3?2, C1B, C2B and C1D, were observed and the following frequencies calculated: TfC1 = 0.77837; TfC2 = 0.1804; TfC3 = 0.03641; TfB = 0.0040; TfD = 0.0008. These gene frequencies have been compared to those found in other populations. Analysis of 101 mother-child pairs was in agreement with an autosomal codominant mode of inheritance.  相似文献   
880.
Do city governments generally behave in keeping with the assumptions underlying the incremental model when they allocate their resources among competing activities? That is to say, do they try to maintain everyone's historical “fair share” of the budget in order to minimize disputes among rival participants in the decision process? Earlier studies have lacked sufficient data to address this question. However, with data from 105 West German cities, the present study is able to provide an answer. The resource allocation behavior of many of those cities seems to conform with the incremental model's assumptions. Yet for other cities, major changes in expenditure patterns from one year to the next are common. The differences in the variability of expenditure patterns across the cities studied are far from random. They are systematically associated with certain characteristics of the municipal environment. These associations, in turn, offer plausible hints about the process that leads to change in cities' spending patterns.  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