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   2769496篇
  免费   210545篇
  国内免费   4605篇
耳鼻咽喉   39474篇
儿科学   85555篇
妇产科学   71890篇
基础医学   406933篇
口腔科学   76904篇
临床医学   253241篇
内科学   532515篇
皮肤病学   56926篇
神经病学   223774篇
特种医学   110264篇
外国民族医学   933篇
外科学   418416篇
综合类   61485篇
现状与发展   3篇
一般理论   1060篇
预防医学   220650篇
眼科学   64492篇
药学   209234篇
  5篇
中国医学   5167篇
肿瘤学   145725篇
  2018年   28199篇
  2016年   24058篇
  2015年   27065篇
  2014年   38498篇
  2013年   58288篇
  2012年   79956篇
  2011年   85120篇
  2010年   49879篇
  2009年   47074篇
  2008年   80251篇
  2007年   85888篇
  2006年   86446篇
  2005年   84014篇
  2004年   81048篇
  2003年   78312篇
  2002年   77194篇
  2001年   126265篇
  2000年   130621篇
  1999年   110163篇
  1998年   31587篇
  1997年   28465篇
  1996年   28323篇
  1995年   27290篇
  1994年   25622篇
  1993年   24044篇
  1992年   89030篇
  1991年   87820篇
  1990年   85319篇
  1989年   82404篇
  1988年   76613篇
  1987年   75521篇
  1986年   71260篇
  1985年   68081篇
  1984年   51324篇
  1983年   43726篇
  1982年   26001篇
  1981年   23215篇
  1980年   21821篇
  1979年   48360篇
  1978年   34061篇
  1977年   28342篇
  1976年   27301篇
  1975年   29401篇
  1974年   35754篇
  1973年   33910篇
  1972年   31761篇
  1971年   29419篇
  1970年   27681篇
  1969年   25663篇
  1968年   23511篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
81.
82.
Clinical Oral Investigations - The aims of this study are to assess different saliva substitutes for their efficacy to lubricate the oral cavity, and to relate this oral lubrication to the ability...  相似文献   
83.
Obtaining accurate assessment data from adolescents in treatment aids clinical decision making and facilitates more accurate outcome evaluations. However, findings could be biased due to underreported substance use and mental health symptoms. This article compares self-reports of youth in non-White matched client–assessor dyads and those in nonmatched dyads. There were no differences on self-reported substance use, but matched youth reported significantly fewer attention deficit/hyperactivity disorder symptoms versus the comparison group. One possible reason for these findings is the effect of in-group stereotype threat. Future studies should examine the potential effect that in-group stereotyping and perceived racism have on the therapeutic relationship.  相似文献   
84.
85.
86.
This study explored the relationship between active mediation, exposure to Daniel Tiger’s Neighborhood, and key indicators of preschoolers’ social and emotional development. One hundred and twenty-seven children aged 2–6 either watched or did not watch 10 episodes of Daniel Tiger’s Neighborhood over a two-week period. Results revealed that preschoolers who watched the program exhibited higher levels of empathy, self-efficacy, and emotion recognition when their regular TV-watching experiences are frequently accompanied by active mediation. This was especially true for younger preschoolers and preschoolers from low-income families. Implications for policy-makers, parents, producers of prosocial programming, and educators are discussed.  相似文献   
87.
88.
On 8 April 2014, a US jury ordered Takeda and Eli Lilly to pay $9 bn in punitive damages after finding that they had concealed the cancer risks associated with pioglitazone. By contrast, on 28 August 2014, the long‐awaited outcome of the 10‐year Kaiser Permanente Northern California study was announced. That study was specifically designed to investigate whether patients exposed to pioglitazone were at an increased risk of bladder cancer and found no association; thus, at last, the controversial issue has been resolved. A review, in retrospect, of the story of the proposed link between pioglitazone and bladder cancer reveals flaws at every stage. In 2012, a BMJ editorial, in keeping with some other contemporary reports, stated ‘it can confidently be assumed that pioglitazone increases the risk of bladder cancer’. Examination of the information which led to such a statement shows that: 1) the pre‐clinical findings of bladder cancer in male rats is not indicative of human risk; 2) there is no association between bladder cancer and pioglitazone in randomized controlled trials, once cases that could not plausibly be related to treatment are removed; and 3) the observational studies that have suggested a link have over‐extrapolated from the data: pioglitazone‐treated patients had more risk factors for bladder cancer than those not treated with pioglitazone. Meanwhile careful study of randomized controlled trials shows evidence of cardiovascular benefit from pioglitazone in Type 2 diabetes, a condition which results, more than anything, in premature cardiovascular death and morbidity.  相似文献   
89.
90.
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