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   2298109篇
  免费   171714篇
  国内免费   3356篇
耳鼻咽喉   32136篇
儿科学   77732篇
妇产科学   63513篇
基础医学   334026篇
口腔科学   63211篇
临床医学   208697篇
内科学   450672篇
皮肤病学   49759篇
神经病学   182462篇
特种医学   88399篇
外国民族医学   898篇
外科学   338157篇
综合类   49153篇
现状与发展   4篇
一般理论   892篇
预防医学   183844篇
眼科学   51866篇
药学   169862篇
  8篇
中国医学   4104篇
肿瘤学   123784篇
  2018年   24028篇
  2017年   18201篇
  2016年   19962篇
  2015年   22871篇
  2014年   31629篇
  2013年   48556篇
  2012年   66483篇
  2011年   70882篇
  2010年   41631篇
  2009年   39925篇
  2008年   67234篇
  2007年   72056篇
  2006年   71940篇
  2005年   70321篇
  2004年   68221篇
  2003年   65638篇
  2002年   64136篇
  2001年   105048篇
  2000年   108228篇
  1999年   91911篇
  1998年   25820篇
  1997年   23303篇
  1996年   23923篇
  1995年   22616篇
  1994年   21290篇
  1993年   19824篇
  1992年   73347篇
  1991年   71954篇
  1990年   69887篇
  1989年   67293篇
  1988年   62204篇
  1987年   61237篇
  1986年   57697篇
  1985年   55088篇
  1984年   41743篇
  1983年   35650篇
  1982年   21019篇
  1981年   19198篇
  1979年   38390篇
  1978年   27616篇
  1977年   23189篇
  1976年   21700篇
  1975年   23339篇
  1974年   27831篇
  1973年   27235篇
  1972年   25431篇
  1971年   23464篇
  1970年   22059篇
  1969年   20548篇
  1968年   18977篇
排序方式: 共有10000条查询结果,搜索用时 12 毫秒
71.
72.
73.
74.
75.
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   
76.
77.
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   
78.
79.
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   
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