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   17923篇
  免费   1161篇
  国内免费   38篇
耳鼻咽喉   119篇
儿科学   700篇
妇产科学   541篇
基础医学   2228篇
口腔科学   195篇
临床医学   2814篇
内科学   3393篇
皮肤病学   187篇
神经病学   1479篇
特种医学   283篇
外国民族医学   1篇
外科学   1364篇
综合类   620篇
一般理论   37篇
预防医学   2565篇
眼科学   351篇
药学   930篇
中国医学   10篇
肿瘤学   1305篇
  2023年   93篇
  2022年   134篇
  2021年   324篇
  2020年   213篇
  2019年   313篇
  2018年   330篇
  2017年   253篇
  2016年   322篇
  2015年   405篇
  2014年   492篇
  2013年   824篇
  2012年   1273篇
  2011年   1381篇
  2010年   633篇
  2009年   588篇
  2008年   1203篇
  2007年   1328篇
  2006年   1255篇
  2005年   1277篇
  2004年   1271篇
  2003年   1216篇
  2002年   1122篇
  2001年   193篇
  2000年   104篇
  1999年   148篇
  1998年   212篇
  1997年   196篇
  1996年   183篇
  1995年   167篇
  1994年   137篇
  1993年   116篇
  1992年   79篇
  1991年   73篇
  1990年   80篇
  1989年   74篇
  1988年   77篇
  1987年   52篇
  1986年   63篇
  1985年   62篇
  1984年   71篇
  1983年   73篇
  1982年   73篇
  1981年   87篇
  1980年   78篇
  1979年   63篇
  1978年   48篇
  1977年   48篇
  1976年   46篇
  1975年   25篇
  1974年   39篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
This article presents data on the awareness of the alcohol beverage warning label among a sample of 5,169 inner city African-American gravidas seeking prenatal care. While the label law was implemented in November 1989, a significant increase in knowledge of the label did not occur until March 1990. Women who predominantly consumed wine coolers and beer, and those under age 30 were more likely to know about the label than their counterparts.  相似文献   
43.
44.
We report an analysis of the qualitative phase of a study of patients' and carers' views of primary care services, focusing on their experiences of access to face-to-face general practitioner (GP) consultations during the period when new access policies were being implemented. Practices interpreted the new policy in various ways; restricted interpretations, including restriction of access to telephone booking, could cause distress to patients. Patients and carers welcomed flexible interpretations of the policy that offered choice, such as a choice of GP, or of booking in advance.  相似文献   
45.
46.
47.
48.
The effects of withdrawal from continuous administration of cocaine on behavioral sensitivity to apomorphine and monoamine receptor density were examined in rats. Subdermal minipumps that delivered either saline or 20 mg/kg/day cocaine hydrochloride were implanted for 2 weeks. Apomorphine-induced stereotypy (0.5 mg/kg, SC) was examined in separate groups of rats either 4 hr or 7, 28, or 60 days after removal of the minipumps. Transient enhanced sensitivity to apomorphine-induced stereotypy occurred during the course of withdrawal. Animals withdrawn from cocaine for 4 hours did not differ from controls in their sensitivity to apomorphine, whereas animals withdrawn from cocaine for 7 days exhibited an increase in apomorphine-induced oral stereotypy relative to controls. However, the enhanced stereotypy response was no longer evident in animals withdrawn for 28–60 days. The animals were sacrificed after behavioral testing, and their brains were assayed for changes in monoamine receptor density in the frontal cortex, caudate-putamen, and nucleus accumbens. The density of 3H-SCH-23390-labeled D1 receptors was altered in all three regions examined in a time-dependent manner that paralleled the changes in behavioral sensitivity to apomorphine. There was a transient decrease in D1 receptor density that was evident by 7 days following withdrawal from continuous cocaine administration and was no longer evident 28 or 60 days posttreatment. There were no changes in 3H-spiroperidol-labeled D2 receptors, 125-pindolol-labeled β-adrenergic receptors, or 3H-ketanserin-labeled 5-HT2 receptors in any of the regions examined at both 4 hr and 7 days after termination of the cocaine infusion. These findings are discussed in terms of their relevance to developing pharmacologic treatments for withdrawal from cocaine. © 1994 Wiley-Liss, Inc.  相似文献   
49.
To address the need for management development in public health, the Centers for Disease Control and Prevention (CDC) established three independent workforce development initiatives aimed primarily at strengthening management and leadership capacity: the Sustainable Management Development Program, the Management Academy for Public Health, and the CDC Leadership and Management Institute. Though independently designed and implemented, the programs share similar guiding principles in their approach to management development: interactive (adult) learning, management tools that reinforce evidence-based decision making, individual feedback, continuous improvement of the learning process, posttraining support for networking and life-long learning, and teamwork. This article will discuss important lessons learned regarding best practices in management and leadership development.  相似文献   
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