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   46565篇
  免费   7493篇
  国内免费   110篇
耳鼻咽喉   361篇
儿科学   1474篇
妇产科学   2171篇
基础医学   3711篇
口腔科学   550篇
临床医学   18586篇
内科学   6801篇
皮肤病学   554篇
神经病学   3383篇
特种医学   949篇
外国民族医学   1篇
外科学   4949篇
综合类   661篇
一般理论   23篇
预防医学   5053篇
眼科学   448篇
药学   2126篇
中国医学   45篇
肿瘤学   2322篇
  2023年   991篇
  2022年   417篇
  2021年   1001篇
  2020年   1030篇
  2019年   940篇
  2018年   1927篇
  2017年   1924篇
  2016年   1978篇
  2015年   2128篇
  2014年   2410篇
  2013年   3028篇
  2012年   2300篇
  2011年   2606篇
  2010年   2092篇
  2009年   2250篇
  2008年   2145篇
  2007年   2054篇
  2006年   2006篇
  2005年   1880篇
  2004年   1695篇
  2003年   1582篇
  2002年   1473篇
  2001年   1112篇
  2000年   842篇
  1999年   900篇
  1998年   805篇
  1997年   879篇
  1996年   861篇
  1995年   734篇
  1994年   575篇
  1993年   475篇
  1992年   598篇
  1991年   584篇
  1990年   597篇
  1989年   505篇
  1988年   401篇
  1987年   412篇
  1986年   340篇
  1985年   386篇
  1984年   307篇
  1983年   254篇
  1982年   217篇
  1981年   194篇
  1980年   167篇
  1979年   245篇
  1978年   200篇
  1977年   171篇
  1976年   164篇
  1974年   159篇
  1972年   158篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
In the USA, the Black Church is among the most important institutions in the Black community, offering numerous spiritual, social and health benefits. Yet, the presence of homonegativity in many Black Churches may mitigate those effects for gay Black youth. This research examines the role of the Church in the lives of gay and bisexual Black youth to understand how they reconcile any tension between their religious and sexual identities. Through interviews with pastors of Black churches (n = 21) and young Black men who have sex with men (n = 30), we explored homonegativity and young men’s experiences within the Black Church. Findings reveal that despite the prevalence of homonegativity within Black churches, religious involvement remains important for young men and many remain involved in non-affirming churches. The importance of the Church for young men stems from their significant involvement as youth and the integration of religion, family and community. Young men may not be able to leave their religious homes as readily as other gay youth given the cultural relevance of the Church. As a result, young men made attempts to conceal their sexuality in church to avoid shame and gossip and find opportunities to balance their sexuality and religiosity.  相似文献   
22.
23.
24.
25.
This randomized controlled trial evaluated the effect of a 5-week daily skin-to-skin contact (SSC) intervention between mothers and their full-term infants, compared with care-as-usual, on exclusive and continued breastfeeding duration during the first post-natal year. Healthy pregnant women (n = 116) from a community sample were enrolled and randomly allocated to the SSC or care-as-usual condition. SSC mothers were requested to provide one daily hour of SSC for the first five post-natal weeks. Twelve months post-partum, mothers indicated the number of exclusive and continued breastfeeding months. Multiple regression analyses were conducted using intention-to-treat, per-protocol and exploratory dose–response frameworks. In intention-to-treat analyses, exclusive and continued breastfeeding duration was not different between groups (exclusive: 3.61 ± 1.99 vs. 3.16 ± 1.77 months; adjusted mean difference 0.28, 95% confidence interval [CI] ?0.33 to 0.89; p = 0.36; continued: 7.98 ± 4.20 vs. 6.75 ± 4.06 months; adjusted mean difference 0.81, 95% CI ?0.46 to 2.08; p = 0.21). In per-protocol analyses, exclusive and continued breastfeeding duration was longer for SSC than care-as-usual dyads (exclusive: 4.89 ± 1.26 vs. 3.25 ± 1.80 months; adjusted mean difference 1.28, 95% CI 0.31–2.24; p = 0.01; continued: 10.81 ± 1.97 vs. 6.98 ± 4.08 months; adjusted mean difference 2.33, 95% CI 0.13–4.54; p = 0.04). Exploratory dose–response effects indicated that more SSC hours predicted longer exclusive and continued breastfeeding duration. This study demonstrates that for the total group, the 5-week daily SSC intervention did not extend exclusive and continued breastfeeding duration. However, for mothers performing a regular daily hour of SSC, this simple and accessible intervention may extend exclusive and continued breastfeeding duration by months. Future studies are required to confirm these promising findings. Trial registration: Netherlands Trial Register (NTR5697).  相似文献   
26.
27.
28.
29.
30.
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