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   18400篇
  免费   332篇
各国政治   510篇
工人农民   1475篇
世界政治   824篇
外交国际关系   600篇
法律   11139篇
中国共产党   34篇
中国政治   128篇
政治理论   3884篇
综合类   138篇
  2021年   64篇
  2020年   157篇
  2019年   138篇
  2018年   1444篇
  2017年   1407篇
  2016年   1264篇
  2015年   292篇
  2014年   247篇
  2013年   915篇
  2012年   421篇
  2011年   1153篇
  2010年   1184篇
  2009年   824篇
  2008年   1039篇
  2007年   1010篇
  2006年   341篇
  2005年   368篇
  2004年   472篇
  2003年   390篇
  2002年   267篇
  2001年   368篇
  2000年   334篇
  1999年   264篇
  1998年   170篇
  1997年   130篇
  1996年   162篇
  1995年   146篇
  1994年   154篇
  1993年   133篇
  1992年   206篇
  1991年   255篇
  1990年   214篇
  1989年   203篇
  1988年   226篇
  1987年   205篇
  1986年   227篇
  1985年   192篇
  1984年   173篇
  1983年   169篇
  1982年   109篇
  1981年   130篇
  1980年   106篇
  1979年   109篇
  1978年   97篇
  1977年   88篇
  1976年   66篇
  1975年   67篇
  1974年   68篇
  1973年   82篇
  1971年   53篇
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
101.
102.
103.
In order to cooperate with voluntary screening programs aimed at the surveillance of the HIV epidemic in Finland, we have studied medicolegal autopsies for HIV antibodies since 1986 using an enzyme immunoassay on postmortem sera. The investigation covered 47.4% and 39.2%, respectively, of all deaths under the age of 65 years in the metropolitan areas of Helsinki and Turku--two cities on the densely populated southern coast of Finland from which most HIV infections have thus far been detected. Nine HIV-positive cases (0.12%) were detected among the 7305 medicolegal autopsies tested in 1986 to 1990. This figure is higher than the prevalence of 0.01 to 0.03% in voluntary screening programs for the general population would suggest. Seven of our cases had previously tested positive, and two were previously unknown cases, indicating that people at high risk are clustered in the medicolegal autopsy series. Of the six cases in an early stage of infection, three committed suicide suggesting the importance of HIV-screening in suicide cases in tracing symptomless HIV carriers. Five of the cases were detected in 1990, a year when the number of new HIV infections had more than doubled compared to the previous two years. This suggests that testing of medicolegal autopsies as surrogate tests for the population gives useful information even in low-prevalence areas like Finland. Such testing has none of the ethical problems of many other back-up surveys, and may be particularly sensitive to early changes in epidemiology.  相似文献   
104.
Distinctive blunt force injuries caused by a crescent wrench.   总被引:1,自引:0,他引:1  
  相似文献   
105.
106.
Considerable research has documented that global perceptions of proceduralv fairness are associated with reductions in relative deprivation (RD). Less research has examined the specific process elements that lead individuals to perceive procedural fairness. In view of this, several researchers have suggested that providing advance notice concerning a negative decision increases perceived justice and thereby lowers levels of RD. Unfortunately, the evidence for this causal relationship is currently limited and is based upon a small number of correlation and role-playing studies. Thus, the present paper reports on two experimental studies that investigate the causal relationship between advance notice and RD. Findings in Study 1 showed that advance notice impacted the cognitive aspects of RD but not the affective or behavioral aspects. However, some methodological limitations were identified. These were corrected and a second experiment was conducted. This time advance notice lowered both the cognitive and affective aspects of RD but still did not impact the behavioral measure. Results are discussed in terms of Tyler's (1987) group value model.  相似文献   
107.
This study uses a structured vignette procedure to assess competency to make treatment decisions in two groups of adolescents, one at risk for institutional placement and the other a matched community sample. Scores on Factual Understanding (the ability to recall facts), Inferential Understanding (the ability to make inferences about those facts), and Reasoning (the ability to weigh risks and benefits of various treatment options and to make choices based on that reasoning) were compared. Results showed that while at-risk adolescents and their community, counterparts did not differ in their factual and inferential understanding abilities, the at-risk adolescents did significantly less well than the community adolescents in reasoning. This difference could not be fully explained by differences in verbal IQ. Girls, no matter what their risk status, scored higher than boys on the Reasoning scale. Implications for legal policies concerning adolescents are discussed.  相似文献   
108.
109.
"Brain death," the determination of human death by showing the irreversible loss of all clinical functions of the brain, has become a worldwide practice. A biophilosophical account of brain death requires four sequential tasks: (1) agreeing on the paradigm of death, a set of preconditions that frame the discussion; (2) determining the definition of death by making explicit the consensual concept of death; (3) determining the criterion of death that proves the definition has been fulfilled by being both necessary and sufficient for death; and (4) determining the tests of death for physicians to employ at the patient's bedside to demonstrate that the criterion of death has been fulfilled. The best definition of death is "the cessation of functioning of the organism as a whole." The whole-brain criterion is the only criterion that is both necessary and sufficient for death. Brain death tests are used only in the unusual case in which a patient's ventilation is being supported. Brain death critics have identified weaknesses in its formulation. But despite its shortcomings, the whole-brain death formulation comprises a concept and public policy that make intuitive and practical sense and that has been well accepted by many societies.  相似文献   
110.
Ethanol was determined by gas chromatography in a variety of tissues and body fluids secured at autopsy in 61 cases. The specimens tested included right and left heart blood, femoral blood, pericardial fluid, cerebrospinal fluid, vitreous humor, urine, stomach contents, and brain. Statistical analysis of the cases revealed no significant differences among the various blood sites tested. However, the variations in blood ethanol concentrations among the various sampling sites within each case were as follows: 40 cases showed differences of less than 25%; 16 cases revealed variability between 25% and 50%, 4 cases had differences exceeding 50%. In one case, satisfactory blood analyses could not be accomplished. The larger variances occurred especially in those instances in which stomach alcohol concentration was 0.50% or greater. In one case, the variability amongst the different blood sites exceeded 400% (femoral blood--0.043%, right atrium--0.070%, root of aorta--0.156%); the brain was 0.050%, and the stomach contents was 1.2%. For all 61 cases, variances in blood alcohol content among the different sampling sites in a single cadaver ranged from 1.8 to 428%.  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