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   2380246篇
  免费   195123篇
  国内免费   4217篇
耳鼻咽喉   34294篇
儿科学   72923篇
妇产科学   63046篇
基础医学   335562篇
口腔科学   67611篇
临床医学   216161篇
内科学   469584篇
皮肤病学   47968篇
神经病学   201196篇
特种医学   96164篇
外国民族医学   891篇
外科学   361045篇
综合类   56379篇
现状与发展   2篇
一般理论   992篇
预防医学   191283篇
眼科学   55621篇
药学   177920篇
  4篇
中国医学   4366篇
肿瘤学   126574篇
  2018年   24316篇
  2016年   20663篇
  2015年   23370篇
  2014年   33687篇
  2013年   51039篇
  2012年   69022篇
  2011年   72575篇
  2010年   42628篇
  2009年   41006篇
  2008年   69025篇
  2007年   73407篇
  2006年   74257篇
  2005年   72329篇
  2004年   69608篇
  2003年   67228篇
  2002年   66481篇
  2001年   112567篇
  2000年   116628篇
  1999年   98423篇
  1998年   27913篇
  1997年   25598篇
  1996年   25498篇
  1995年   24637篇
  1994年   23194篇
  1993年   21589篇
  1992年   79461篇
  1991年   76461篇
  1990年   73646篇
  1989年   70908篇
  1988年   65904篇
  1987年   64854篇
  1986年   61373篇
  1985年   58446篇
  1984年   44265篇
  1983年   37698篇
  1982年   22923篇
  1981年   20364篇
  1980年   19072篇
  1979年   41359篇
  1978年   29027篇
  1977年   24390篇
  1976年   22861篇
  1975年   23989篇
  1974年   29681篇
  1973年   28074篇
  1972年   26261篇
  1971年   24179篇
  1970年   22780篇
  1969年   21112篇
  1968年   19174篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
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   
73.
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   
74.
75.
76.
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   
77.
78.
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   
79.
80.
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