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   2182892篇
  免费   153374篇
  国内免费   3198篇
耳鼻咽喉   31241篇
儿科学   71637篇
妇产科学   62066篇
基础医学   314311篇
口腔科学   61423篇
临床医学   189791篇
内科学   420104篇
皮肤病学   47342篇
神经病学   168181篇
特种医学   86108篇
外国民族医学   564篇
外科学   335219篇
综合类   45293篇
现状与发展   2篇
一般理论   551篇
预防医学   157109篇
眼科学   49969篇
药学   170460篇
  9篇
中国医学   4905篇
肿瘤学   123179篇
  2018年   21424篇
  2016年   18601篇
  2015年   21119篇
  2014年   28884篇
  2013年   43358篇
  2012年   59449篇
  2011年   63433篇
  2010年   37504篇
  2009年   35207篇
  2008年   60432篇
  2007年   65076篇
  2006年   66104篇
  2005年   64035篇
  2004年   61498篇
  2003年   59530篇
  2002年   58143篇
  2001年   107253篇
  2000年   110087篇
  1999年   92623篇
  1998年   24800篇
  1997年   22032篇
  1996年   22133篇
  1995年   20917篇
  1994年   19435篇
  1993年   18145篇
  1992年   72423篇
  1991年   70487篇
  1990年   69535篇
  1989年   67234篇
  1988年   61851篇
  1987年   60456篇
  1986年   57404篇
  1985年   54373篇
  1984年   40084篇
  1983年   34408篇
  1982年   19748篇
  1981年   17437篇
  1979年   37060篇
  1978年   25559篇
  1977年   22424篇
  1976年   20415篇
  1975年   22773篇
  1974年   26685篇
  1973年   25784篇
  1972年   24628篇
  1971年   22994篇
  1970年   21250篇
  1969年   20582篇
  1968年   18868篇
  1967年   16721篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
52.
53.
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   
54.
55.
56.
57.
58.
59.
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   
60.
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