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   1088639篇
  免费   72742篇
  国内免费   1386篇
耳鼻咽喉   15154篇
儿科学   35035篇
妇产科学   28875篇
基础医学   155171篇
口腔科学   30016篇
临床医学   96527篇
内科学   206318篇
皮肤病学   24555篇
神经病学   82762篇
特种医学   43404篇
外国民族医学   204篇
外科学   164635篇
综合类   22043篇
现状与发展   1篇
一般理论   276篇
预防医学   76102篇
眼科学   24826篇
药学   87150篇
  7篇
中国医学   2807篇
肿瘤学   66899篇
  2019年   7938篇
  2018年   11484篇
  2017年   9065篇
  2016年   10272篇
  2015年   11456篇
  2014年   15551篇
  2013年   22581篇
  2012年   31185篇
  2011年   32918篇
  2010年   19297篇
  2009年   18106篇
  2008年   30527篇
  2007年   32635篇
  2006年   33297篇
  2005年   31623篇
  2004年   30335篇
  2003年   29116篇
  2002年   28015篇
  2001年   60456篇
  2000年   61904篇
  1999年   51321篇
  1998年   12621篇
  1997年   11136篇
  1996年   11159篇
  1995年   10484篇
  1994年   9461篇
  1993年   8990篇
  1992年   38148篇
  1991年   36583篇
  1990年   36068篇
  1989年   34605篇
  1988年   31141篇
  1987年   30253篇
  1986年   28454篇
  1985年   26676篇
  1984年   19359篇
  1983年   16283篇
  1982年   8953篇
  1979年   17207篇
  1978年   11536篇
  1977年   10347篇
  1976年   8968篇
  1975年   10176篇
  1974年   11778篇
  1973年   11425篇
  1972年   10875篇
  1971年   10180篇
  1970年   9373篇
  1969年   9035篇
  1968年   7996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