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   18113篇
  免费   309篇
各国政治   489篇
工人农民   1468篇
世界政治   766篇
外交国际关系   576篇
法律   11042篇
中国共产党   34篇
中国政治   129篇
政治理论   3782篇
综合类   136篇
  2021年   63篇
  2020年   152篇
  2019年   131篇
  2018年   1426篇
  2017年   1384篇
  2016年   1244篇
  2015年   288篇
  2014年   237篇
  2013年   861篇
  2012年   417篇
  2011年   1150篇
  2010年   1179篇
  2009年   815篇
  2008年   1032篇
  2007年   999篇
  2006年   339篇
  2005年   362篇
  2004年   468篇
  2003年   386篇
  2002年   276篇
  2001年   356篇
  2000年   331篇
  1999年   262篇
  1998年   167篇
  1997年   126篇
  1996年   161篇
  1995年   142篇
  1994年   149篇
  1993年   129篇
  1992年   199篇
  1991年   249篇
  1990年   212篇
  1989年   198篇
  1988年   221篇
  1987年   202篇
  1986年   220篇
  1985年   193篇
  1984年   172篇
  1983年   166篇
  1982年   107篇
  1981年   123篇
  1980年   101篇
  1979年   107篇
  1978年   97篇
  1977年   86篇
  1976年   64篇
  1975年   64篇
  1974年   65篇
  1973年   77篇
  1971年   50篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
891.
Although the Federal Health Privacy Rule has evened out some of the inconsistencies between states' health privacy laws, gaps in protection still remain. Furthermore, the Federal Rule contains some lax standards for the disclosure of health information. State laws can play a vital role in filling these gaps and strengthening the protections afforded health information. By enacting legislation that has higher privacy-protective standards than the Federal Health Privacy Rule, states can play three important roles. First, because they can directly regulate entities that are beyond HHS's mandate, states can afford their citizens a broader degree of privacy protection than the Federal Health Privacy Rule. Second, by having state health privacy laws, states can enforce privacy protections at the local level. Finally, action by the states can positively influence health privacy policies at the federal level by raising the standard as to what constitutes sufficient privacy protection. High privacy protections imposed by states may serve as the standard for comprehensive federal legislation, if and when Congress reconsiders the issue. So far, states' reactions to the Federal Privacy Rule have been mixed. Only time will tell whether states will assume the mantle of leadership on health privacy or relinquish their role as the primary protectors of health information.  相似文献   
892.
Fighting G-force     
Rosenberg D 《Newsweek》2002,139(23):49
  相似文献   
893.
Mitochondrial DNA (mtDNA) analysis of forensic samples typically is performed when the quantity and quality of DNA are insufficient for nuclear DNA analysis or when maternal relatives may be the only reference source. Many of the steps required in the analytical process are both lengthy and labor intensive. Therefore, improvements in the process that reduce labor without compromising the quality of the data are desirable. The current procedure requires purification of the amplicons by centrifugal filtration after PCR and prior to cycle sequencing. Because this method requires several manipulations to perform, alternate cleanup procedures were investigated. These include the use of 1) Qiagen QlAquick PCR Purification columns, 2) Concert Rapid PCR Purification columns, and 3) ExoSAP-IT reagent. When the yield of purified amplicons, quality of the sequence profile, and ease of assay were evaluated, the use of ExoSAP-IT reagent for post-amplification purification was chosen to replace the filtration method.  相似文献   
894.
Premenstrual Syndrome (PMS) is believed to affect up to 90% of women of reproductive age. A small subset of women have been identified who actually experience psychotic symptoms in the premenstrual phase of their cycles. Not surprisingly, PMS has made it into the courts where it has been offered as a defense for criminal acts. The defense has generally fared poorly in the United States, although it has been successfully used as a factor in supporting diminished capacity in Great Britain. The following paper sets out to review the medical literature on premenstrual syndrome with a particular focus on premenstrual psychosis. Available literature from both medical and legal sources is then utilized to investigate instances in which premenstrual psychosis has been invoked as a defense in the courts.  相似文献   
895.
To investigate socioemotional influences on children's eyewitness accuracy, we examined children's reports for activities they were motivated to conceal. Forty-eight 3–6-year-old children participated in a standardized play session with their mothers. Half of the children were told by an experimenter not to play with certain toys, but did so at the urging of their mothers, who told their children to keep the play activities secret. The remaining children were not restricted from playing with the toys, nor told by their mothers to keep the play activities secret. Later, all children were interviewed about the activities with free narrative and detailed questions. Half were given an interview that consisted of highly suggestive questions; half were given an interview consisting of specific, less suggestive questions. Results indicated that older children who were instructed to keep events secret withheld more information than did older children not told to keep events secret. Younger children's reports were not significantly affected by the secret manipulation. There were no significant effects associated with interview type. We discuss implications for understanding the development of children's knowledge and use of secrecy, and applications of the research to issues that arise when child witnesses give reports in legal contexts.  相似文献   
896.
Personal identification based on radiographic vertebral features   总被引:4,自引:0,他引:4  
Personal identification of human remains constitutes about 10% of the normal caseload of any forensic medicine practice. Identification can be achieved by a variety of methods, one of which is the comparison of antemortem and postmortem radiographs. There are numerous accounts of cranial and dental radiographic features useful for identification, whereas the availability of postcranial radiographs and especially plates that depict the vertebral column is less widespread among the forensic community. The authors here review the various vertebral features instrumental in positive identification that can be identified on radiographs of the spine.  相似文献   
897.
898.
The effects of a Micelle Encapsulator Fire Suppression Agent (F-500, Hazard Control Technologies Inc., Fayetteville, Georgia) on the routine analysis of fire debris samples by Gas Chromatography (GC) were studied. When mixed with water the product can be used in the suppression of Class A and Class B fires. Laboratory tests were performed to determine whether or not the product has any effect on the analysis for ignitable liquids by GC, in particular for gasoline, medium petroleum distillates. and heavy petroleum distillates. Test burns were suppressed using either the micelle encapsulator or water and samples collected from these burns were analyzed. The results of analysis show that use of the micelle encapsulator at a fire scene may affect the chromatographic data obtained from samples collected by the investigator. However, the effect does not prevent the identification of common ignitable liquids in fire debris samples.  相似文献   
899.
900.
A method for identifying the group appurtenance of biological objects from subjects suffering from various diseases is developed. The method can be used in examination of putrefactive objects (blood, secretions, hair, etc.) and in cases when the group appurtenance cannot be identified by other methods.  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