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   3160704篇
  免费   261046篇
  国内免费   13790篇
耳鼻咽喉   43671篇
儿科学   99853篇
妇产科学   81427篇
基础医学   507368篇
口腔科学   84226篇
临床医学   278384篇
内科学   556168篇
皮肤病学   85723篇
神经病学   272413篇
特种医学   125330篇
外国民族医学   361篇
外科学   496927篇
综合类   96727篇
现状与发展   23篇
一般理论   2167篇
预防医学   263853篇
眼科学   71134篇
药学   214291篇
  22篇
中国医学   9195篇
肿瘤学   146277篇
  2021年   54626篇
  2020年   34850篇
  2019年   57795篇
  2018年   70221篇
  2017年   53544篇
  2016年   59072篇
  2015年   73416篇
  2014年   107413篇
  2013年   172449篇
  2012年   84013篇
  2011年   83010篇
  2010年   114191篇
  2009年   119484篇
  2008年   70909篇
  2007年   72912篇
  2006年   83964篇
  2005年   79970篇
  2004年   81904篇
  2003年   73283篇
  2002年   63381篇
  2001年   89195篇
  2000年   81788篇
  1999年   84927篇
  1998年   63418篇
  1997年   61770篇
  1996年   59481篇
  1995年   54929篇
  1994年   49122篇
  1993年   45914篇
  1992年   58536篇
  1991年   55221篇
  1990年   52396篇
  1989年   51790篇
  1988年   48339篇
  1987年   47252篇
  1986年   45299篇
  1985年   45489篇
  1984年   43087篇
  1983年   39915篇
  1982年   39838篇
  1981年   37589篇
  1980年   35551篇
  1979年   35087篇
  1978年   32153篇
  1977年   29699篇
  1976年   27278篇
  1975年   25790篇
  1974年   26281篇
  1973年   25128篇
  1972年   23657篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
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   
92.
93.
94.
95.
96.
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   
97.
98.
99.
100.
Interstitial cystitis/bladder pain syndrome (IC/BPS) and vulvodynia are chronic pain syndromes that appear to be intertwined from the perspectives of embryology, pathology and epidemiology. These associations may account for similar responses to various therapies.  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