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   3018867篇
  免费   219381篇
  国内免费   5136篇
耳鼻咽喉   41490篇
儿科学   99597篇
妇产科学   82216篇
基础医学   441924篇
口腔科学   84205篇
临床医学   274296篇
内科学   580739篇
皮肤病学   66954篇
神经病学   239055篇
特种医学   113713篇
外国民族医学   776篇
外科学   451805篇
综合类   65369篇
现状与发展   12篇
一般理论   1183篇
预防医学   238741篇
眼科学   70596篇
药学   223076篇
  13篇
中国医学   5905篇
肿瘤学   161719篇
  2019年   24316篇
  2018年   33686篇
  2017年   25591篇
  2016年   28735篇
  2015年   32311篇
  2014年   45562篇
  2013年   68913篇
  2012年   93871篇
  2011年   99932篇
  2010年   59505篇
  2009年   56094篇
  2008年   93741篇
  2007年   99834篇
  2006年   100814篇
  2005年   97642篇
  2004年   93796篇
  2003年   90315篇
  2002年   87495篇
  2001年   136214篇
  2000年   139808篇
  1999年   117657篇
  1998年   34338篇
  1997年   30326篇
  1996年   30561篇
  1995年   29056篇
  1994年   26824篇
  1993年   25271篇
  1992年   92098篇
  1991年   90040篇
  1990年   87998篇
  1989年   84792篇
  1988年   77792篇
  1987年   76781篇
  1986年   71937篇
  1985年   69226篇
  1984年   51767篇
  1983年   43936篇
  1982年   26354篇
  1979年   47763篇
  1978年   34235篇
  1977年   28593篇
  1976年   27403篇
  1975年   29237篇
  1974年   35241篇
  1973年   33573篇
  1972年   31359篇
  1971年   29662篇
  1970年   27331篇
  1969年   25979篇
  1968年   23896篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
41.
42.
43.
ContextIt is especially important that patients are well informed when making high-stakes, preference-sensitive decisions like those on the Physician Orders for Life-Sustaining Treatment (POLST) form. However, there is currently no way to easily evaluate whether patients understand key concepts when making these important decisions.ObjectivesTo develop a POLST knowledge survey.MethodsExpert (n = 62) ratings of key POLST facts were used to select items for a POLST knowledge survey. The survey was administered to nursing facility residents (n = 97) and surrogate decision-makers (n = 112). A subset (n = 135) were re-administered the survey after a standardized advance care planning discussion to assess the scale's responsiveness to change.ResultsThe 19-item survey demonstrated adequate reliability (α = 0.72.). Residents' scores (x = 11.4, standard deviation 3.3) were significantly lower than surrogate scores (x = 14.7, standard deviation 2.5) (P < 0.001). Scores for both groups increased significantly after administration of a standardized advance care planning discussion (P < 0.001). Although being a surrogate, age, race, education, cognitive functioning, and health literacy were significantly associated with higher POLST Knowledge Survey scores in univariate analyses, only being a surrogate (P < 0.001) and being white (P = 0.028) remained significantly associated with higher scores in multivariate analyses.ConclusionThe 19-item POLST Knowledge Survey demonstrated adequate reliability and responsiveness to change. Findings suggest the survey could be used to identify knowledge deficits and provide targeted education to ensure adequate understanding of key clinical decisions when completing POLST.  相似文献   
44.
45.
46.
47.
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   
48.
49.
50.
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