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   1390381篇
  免费   119843篇
  国内免费   10379篇
耳鼻咽喉   17041篇
儿科学   43468篇
妇产科学   37107篇
基础医学   189833篇
口腔科学   37265篇
临床医学   128270篇
内科学   286031篇
皮肤病学   32349篇
神经病学   113145篇
特种医学   57525篇
外国民族医学   316篇
外科学   215373篇
综合类   41777篇
现状与发展   21篇
一般理论   415篇
预防医学   110187篇
眼科学   29811篇
药学   99651篇
  43篇
中国医学   5690篇
肿瘤学   75285篇
  2021年   11792篇
  2018年   15437篇
  2017年   12388篇
  2016年   14486篇
  2015年   16960篇
  2014年   23239篇
  2013年   32436篇
  2012年   40293篇
  2011年   43451篇
  2010年   27012篇
  2009年   26080篇
  2008年   39108篇
  2007年   41545篇
  2006年   42679篇
  2005年   41261篇
  2004年   38538篇
  2003年   37527篇
  2002年   35271篇
  2001年   67155篇
  2000年   69092篇
  1999年   57853篇
  1998年   17600篇
  1997年   15840篇
  1996年   16647篇
  1995年   16833篇
  1994年   15604篇
  1993年   14462篇
  1992年   47450篇
  1991年   46029篇
  1990年   44236篇
  1989年   42026篇
  1988年   38969篇
  1987年   38233篇
  1986年   35983篇
  1985年   34735篇
  1984年   26400篇
  1983年   22148篇
  1982年   13862篇
  1981年   12466篇
  1980年   11731篇
  1979年   23557篇
  1978年   17072篇
  1977年   14387篇
  1976年   13182篇
  1975年   13722篇
  1974年   16094篇
  1973年   15398篇
  1972年   14173篇
  1971年   13036篇
  1970年   11880篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
The current situation in which the humanities are disparaged affects all university disciplines, including nursing, in whose historical evolution the humanities have always been present in one form or another. Looking beyond this disrepute, this study proposes that nursing renew its attention to classical philosophy. Specifically, it invites a close reading of Xenophon's Anabasis and Plato's Meno, to get three related goals: to show how the use of ancient texts are very valuable tools for the philosophical initiation of nursing students and can help them reflect on their choice of nursing as a practical activity; to reflect on the problem of virtue and the nature of the good life; and to show how the interaction with ancient texts allows students to reflect on questions and issues of life, theirs and others, that are not open to investigation through a purely scientific method. Consequently, both Anabasis and Meno readings strengthen the intellectual relationship between philosophy and nursing, enabling the latter to delve deeper into the key questions of its own thought as a discipline.  相似文献   
62.
患者男,64岁,因头颅增大、面部变长,颧骨隆起、下颌增大、双手掌肥厚、双手指粗短30余年,乳房肿物1年余就诊。患者30余年前无明显诱因出现渐进性手足增大,双手掌肥厚,嘴唇变厚,下颌增大,眉弓及颧骨突出,皮肤增厚,无乳腺增大、泌乳,未诊治……  相似文献   
63.
Obesity Surgery - Laparoscopic sleeve gastrectomy (LSG) is increasingly playing a key role in obesity management. Such operations, however, carry complications sometimes including leaks. The...  相似文献   
64.
Lasers in Medical Science - Studies reported the harmful effects of 2,4-D on body tissues, provoking changes in the anatomy and physiology of the kidneys, liver, and testicles. Thus, the objective...  相似文献   
65.
In this article, a model-free off-policy reinforcement learning algorithm is applied to address the optimal tracking problem based on multiplayer non-zero-sum games for discrete-time linear systems. In contrast to the traditional method and the policy iteration method for solving the optimal tracking problems, the proposed algorithm operates with the system data rather than the knowledge of the system dynamics. For performing the proposed algorithm, an auxiliary augmented system is constructed via assembling the original system and the reference trajectory while a discount factor is introduced into the performance indexes. It is analyzed that the solutions of the proposed algorithm converge to the Nash equilibrium and the result is not influenced by the probing noise. Two simulations are presented to verify the feasibility and effectiveness of the proposed algorithm.  相似文献   
66.
67.
Behçet disease is a complex, multisystem disease characterized by recurrent oral and genital ulcerations. It rarely occurs in infants or children. Neonatal Behçet disease has been reported in infants whose ulcers resolve at or before 9 weeks of age. Few cases of neonatal Behçet disease persisting into childhood have previously been reported. We report the case of a 1‐month‐old infant who presented with severe recurrent genital ulcerations and at 6 months developed recurrent oral ulcerations. Her orogenital ulcerations continue to recur. Human leukocyte antigen testing revealed HLA‐B51 and B44 positivity. This is a case of pediatric Behçet disease in the neonatal period. Behçet disease should be considered in the differential diagnosis of recurrent genital and oral ulcerations in infants and children.  相似文献   
68.
69.
70.
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