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   10924篇
  免费   981篇
  国内免费   17篇
耳鼻咽喉   85篇
儿科学   275篇
妇产科学   249篇
基础医学   1431篇
口腔科学   257篇
临床医学   1345篇
内科学   1764篇
皮肤病学   262篇
神经病学   1198篇
特种医学   382篇
外科学   1572篇
综合类   262篇
一般理论   6篇
预防医学   1263篇
眼科学   253篇
药学   872篇
中国医学   13篇
肿瘤学   433篇
  2023年   60篇
  2022年   90篇
  2021年   171篇
  2020年   117篇
  2019年   193篇
  2018年   213篇
  2017年   182篇
  2016年   153篇
  2015年   202篇
  2014年   255篇
  2013年   427篇
  2012年   648篇
  2011年   642篇
  2010年   301篇
  2009年   317篇
  2008年   578篇
  2007年   612篇
  2006年   650篇
  2005年   570篇
  2004年   561篇
  2003年   497篇
  2002年   492篇
  2001年   270篇
  2000年   229篇
  1999年   240篇
  1998年   146篇
  1997年   124篇
  1996年   104篇
  1995年   90篇
  1994年   90篇
  1993年   91篇
  1992年   185篇
  1991年   181篇
  1990年   148篇
  1989年   157篇
  1988年   145篇
  1987年   152篇
  1986年   135篇
  1985年   149篇
  1984年   117篇
  1983年   114篇
  1982年   71篇
  1981年   60篇
  1980年   74篇
  1979年   95篇
  1978年   73篇
  1977年   68篇
  1975年   56篇
  1974年   70篇
  1969年   50篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
In Britain, teenage pregnancy is seen as both a cause and a consequence of social exclusion. The emphasis on 'prevention' of teenage pregnancy and a limited conception of 'support' within the Teenage Pregnancy Strategy (Social Exclusion Unit, 1999) positions parenthood for young people as a negative choice; this dominant discourse is likely to influence young people's reproductive decisions and experiences. With this in mind, this article focuses on a key finding from a multidisciplinary empirical research study, conducted in a city in the West Midlands of England, which considered and explored young people's experience of support before and following termination and miscarriage. Data were collected via in-depth interviews with professionals and practitioners (n = 15), young mothers (n = 4) and one young father. Although termination and miscarriage are generally perceived as distinct and different issues, the data suggest that the issues become more blurred where younger women are concerned. The experiences of young, 'inappropriately pregnant teenagers' often remain unacknowledged and devalued. This analysis highlights the social and political context in which young women experience termination and miscarriage, and suggests that termination and miscarriage should be acknowledged as significant medical, social and emotional events in the lives of young people.  相似文献   
102.
103.
104.
105.
The emergence of SARS-CoV-2 triggering the COVID-19 pandemic ranks as arguably the greatest medical emergency of the last century. COVID-19 has highlighted health disparities both within and between countries and will leave a lasting impact on global society. Nonetheless, substantial investment in life sciences over recent decades has facilitated a rapid scientific response with innovations in viral characterization, testing, and sequencing. Perhaps most remarkably, this permitted the development of highly effective vaccines, which are being distributed globally at unprecedented speed. In contrast, drug treatments for the established disease have delivered limited benefits so far. Innovative and rapid approaches in the design and execution of large-scale clinical trials and repurposing of existing drugs have saved many lives; however, many more remain at risk. In this review we describe challenges and unmet needs, discuss existing therapeutics, and address future opportunities. Consideration is given to factors that have hindered drug development in order to support planning for the next pandemic challenge and to allow rapid and cost-effective development of new therapeutics with equitable delivery.  相似文献   
106.
We evaluated whether demographics and COVID-19 symptoms predicted COVID-19 deaths among healthcare workers (HCWs) in the United States by comparing COVID-19 deaths in HCWs with 3 control groups (HCW nondeaths, non-HCW deaths, and non-HCW nondeaths) using a case–control design. We obtained patient-level data of 33 variables reported during January 1, 2020–October 12, 2021, in all US states. We used logistic regression analysis while controlling for confounders. We found that persons who were >50 years of age, male, Black, or Asian experienced significantly more deaths than matched controls. In addition, HCWs who died had higher risks for the most severe clinical indicators. We also found that the most indicative symptoms were preexisting medical conditions, shortness of breath, fever, cough, and gastrointestinal symptoms. In summary, minority, male, and older HCWs had greater risk for COVID-19 death. Severe clinical indicators and specific symptoms may predict COVID-19–related deaths among HCWs.  相似文献   
107.
OBJECTIVE: This retrospective study investigated the specificity of restricted water diffusion for the diagnosis of brain abscess. Two of five rim-enhancing brain masses with restricted water diffusion (apparent diffusion coefficient of 0.79 [10(-3) mm(2)/sec] or less) were brain abscesses, but diagnoses in the other cases were metastatic squamous cell carcinoma (two cases) and radiation necrosis. CONCLUSION: Although an important diagnostic sign, restricted water diffusion is not specific for brain abscess.  相似文献   
108.
109.
110.
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