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   25849篇
  免费   5517篇
  国内免费   139篇
耳鼻咽喉   108篇
儿科学   578篇
妇产科学   1839篇
基础医学   1091篇
口腔科学   233篇
临床医学   15910篇
内科学   3860篇
皮肤病学   239篇
神经病学   1458篇
特种医学   484篇
外科学   1579篇
综合类   69篇
预防医学   2110篇
眼科学   70篇
药学   552篇
中国医学   16篇
肿瘤学   1309篇
  2024年   66篇
  2023年   899篇
  2022年   294篇
  2021年   591篇
  2020年   838篇
  2019年   486篇
  2018年   1384篇
  2017年   1581篇
  2016年   1694篇
  2015年   1805篇
  2014年   1891篇
  2013年   2210篇
  2012年   1112篇
  2011年   1358篇
  2010年   1421篇
  2009年   1629篇
  2008年   1046篇
  2007年   916篇
  2006年   904篇
  2005年   733篇
  2004年   630篇
  2003年   545篇
  2002年   443篇
  2001年   484篇
  2000年   285篇
  1999年   445篇
  1998年   617篇
  1997年   720篇
  1996年   660篇
  1995年   592篇
  1994年   423篇
  1993年   349篇
  1992年   264篇
  1991年   244篇
  1990年   243篇
  1989年   199篇
  1988年   146篇
  1987年   136篇
  1986年   129篇
  1985年   146篇
  1984年   109篇
  1983年   100篇
  1982年   85篇
  1981年   92篇
  1980年   52篇
  1979年   80篇
  1978年   60篇
  1977年   69篇
  1976年   68篇
  1972年   81篇
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
101.
102.
The most common cause of illness in infancy and childhood is acute infection of the respiratory tract. Several recent studies have reported that life-threatening respiratory disease in infancy, such as pneumonia and bronchiolitis, is directly related to the smoking habits of parents. The effects of smoking are more hazardous to youngsters because babies and young children breathe more rapidly than adults. Because of this higher breathing rate, they inhale more air—and more pollution—in comparison to their total body weight. The harmful effects of cigarette smoking on infants and children and recommendations for specific interventions to minimize or eliminate this health hazard are discussed.  相似文献   
103.
A novel injectable scaffolding matrix (E-Matrix) has been developed to accelerate wound healing in diabetic foot ulcers. This porcine collagen-derived matrix is designed to mimic tertiary embryonic connective tissue and to stimulate fetal wound repair mechanisms including angiogenesis. In vitro and animal studies have indicated a beneficial effect on tissue growth and an acceptable safety profile. In this report, we describe the initial use of this product in a pilot study of six humans with chronic nonhealing diabetic foot ulcers. A dramatic initial response to injection was seen, with an average wound size reduction of 72% 2 weeks after injection. Randomized trials are underway to define the potential benefit of this new treatment modality for diabetic foot ulcers.  相似文献   
104.
105.
PROBLEM: To compare depressive symptoms in children with attention deficit hyperactivity disorder (ADHD) to those in healthy children, and to explore the influence of individual and family factors on level of depression. METHODS: Individual interviews with 68 children, ages 7 to 12 years, in order to complete the Children's Depression Inventory. FINDINGS: Children with ADHD reported significantly more depressive symptoms than did children without ADHD; 14.7% of children with ADHD reached the threshold of a 19 point score, which suggests clinical depression. No significant effects of individual and family factors on level of depression were found. CONCLUSIONS: Children with ADHD are more inclined to experience depressive symptoms than are healthy children. To plan appropriate interventions, nurses evaluating and working with children with ADHD should always consider a possible coexistence of depressive symptoms.  相似文献   
106.
107.
Carcinogenesis, 25, 229–235, 2004 We reported the association of  相似文献   
108.
109.
This paper describes a complex set of patient and nursing data from 83 psychiatric wards. It explains how the data were collected and organized into a meaningful format using a quality league-table. The patient and nursing characteristics of high quality psychiatric wards ranking above the 74th percentile and the characteristics of low quality wards falling below the 26th percentile are compared and examined in detail. Startling similarities and differences in patient activity, nursing activity, and nursing quality in high and low quality wards are highlighted. Finally, some implications of the findings for nursing practice, management, and education are considered.  相似文献   
110.
The Stranger     
J Emerg Nurs 1998;24:622.  相似文献   
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