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   1131857篇
  免费   75657篇
  国内免费   1680篇
耳鼻咽喉   15593篇
儿科学   36010篇
妇产科学   30058篇
基础医学   160407篇
口腔科学   30898篇
临床医学   100733篇
内科学   216382篇
皮肤病学   25142篇
神经病学   85921篇
特种医学   44683篇
外国民族医学   203篇
外科学   171797篇
综合类   22638篇
现状与发展   2篇
一般理论   362篇
预防医学   79488篇
眼科学   26238篇
药学   90127篇
  7篇
中国医学   2915篇
肿瘤学   69590篇
  2021年   8570篇
  2019年   8624篇
  2018年   12373篇
  2017年   9646篇
  2016年   10944篇
  2015年   12241篇
  2014年   16832篇
  2013年   24746篇
  2012年   33922篇
  2011年   35959篇
  2010年   21056篇
  2009年   19778篇
  2008年   33556篇
  2007年   35808篇
  2006年   36296篇
  2005年   34731篇
  2004年   33188篇
  2003年   31663篇
  2002年   30614篇
  2001年   60620篇
  2000年   62002篇
  1999年   51542篇
  1998年   13127篇
  1997年   11551篇
  1996年   11463篇
  1995年   10772篇
  1994年   9776篇
  1993年   9257篇
  1992年   38250篇
  1991年   36711篇
  1990年   36105篇
  1989年   34662篇
  1988年   31214篇
  1987年   30323篇
  1986年   28541篇
  1985年   26831篇
  1984年   19572篇
  1983年   16484篇
  1982年   9314篇
  1979年   17311篇
  1978年   11696篇
  1977年   10528篇
  1976年   9084篇
  1975年   10345篇
  1974年   11884篇
  1973年   11477篇
  1972年   10932篇
  1971年   10186篇
  1970年   9381篇
  1969年   9033篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
BackgroundSecond-hand smoking or environmental tobacco smoke is a critical health risk. Children are the most vulnerable to second-hand smoking because of their small bronchial ducts, less developed immunity, and low-physical activity.ObjectivesThe purpose of this study was to ascertain the effects of second-hand smoking on lung functions in athlete and non-athlete school-aged children.MethodsThis observational study included forty-six school-aged children, their age was 8–15 years, assigned to three groups; 2 study groups and 1 control group (n=15). The study groups comprised of 16 football players, and of 15 cyclists. Lung functions were evaluated recording forced vital capacity, forced expiratory volume in 1 sec and peak expiratory flow using digital spirometer.ResultsAll measures were recorded in definite values and the children were also classified into second-hand smoking (SH), or non-exposed to tobacco smoking (NE). The findings presented a significant increase (p<0.05) of the study groups in forced vital capacity, forced expiratory volume in 1 sec and peak expiratory flow solely for the non-exposed children. However, there were non-significant differences between the cyclists and football players or between the passive smoking children and non-exposed children in any of the two study groups (p>0.05).ConclusionThe outcomes of this study suggest beneficial influences of the sports activity on the lung functions, without different influences of the cyclists and football players on the lung functions.  相似文献   
9.
As millions of people turn to social media for health information, better understanding the factors that guide health-related judgments and perceptions in this context is imperative. We report on two Web experiments (n > 400 total) examining the power of society’s widespread weight bias and related stereotypes to influence nutrition judgments in social media spaces. In Experiment 1, meals were judged as lower in nutritional quality when the person who recommended them (the source) was depicted as obese rather than of normal weight, an effect mediated by stereotypic beliefs about the source as a generally unhealthy person. Experiment 2 replicated this effect, which—notably—remained significant when controlling for objective nutritional information (calories and fat content). Results highlight spillover effects of weight bias that extend beyond person perception to color impressions of objects (here, food) that are associated with stigmatized attributes. Implications for everyday nutrition judgments and public health are considered.  相似文献   
10.
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