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   23672篇
  免费   6144篇
  国内免费   138篇
耳鼻咽喉   639篇
儿科学   720篇
妇产科学   743篇
基础医学   812篇
口腔科学   2703篇
临床医学   4402篇
内科学   5609篇
皮肤病学   578篇
神经病学   2078篇
特种医学   1086篇
外科学   4029篇
综合类   105篇
现状与发展   12篇
预防医学   2864篇
眼科学   390篇
药学   335篇
中国医学   15篇
肿瘤学   2834篇
  2024年   138篇
  2023年   1099篇
  2022年   372篇
  2021年   685篇
  2020年   1249篇
  2019年   537篇
  2018年   1397篇
  2017年   1338篇
  2016年   1550篇
  2015年   1633篇
  2014年   2032篇
  2013年   2474篇
  2012年   912篇
  2011年   874篇
  2010年   1452篇
  2009年   2024篇
  2008年   863篇
  2007年   617篇
  2006年   761篇
  2005年   570篇
  2004年   423篇
  2003年   384篇
  2002年   344篇
  2001年   440篇
  2000年   338篇
  1999年   435篇
  1998年   524篇
  1997年   513篇
  1996年   569篇
  1995年   407篇
  1994年   318篇
  1993年   282篇
  1992年   220篇
  1991年   196篇
  1990年   181篇
  1989年   180篇
  1988年   170篇
  1987年   169篇
  1986年   143篇
  1985年   139篇
  1984年   109篇
  1983年   136篇
  1982年   112篇
  1981年   75篇
  1980年   58篇
  1979年   57篇
  1978年   53篇
  1977年   53篇
  1976年   48篇
  1975年   49篇
排序方式: 共有10000条查询结果,搜索用时 710 毫秒
61.
Phonetics, esthetics, function, and comfort form the foundation of a successful dental prosthesis. A review of the mechanics of speech as well as common speech problems encountered with a removable maxillary prosthesis are presented. The use of a palatogram to aid the clinician in the assessment and resolution of speech problems associated with a maxillary denture is demonstrated.  相似文献   
62.
63.
64.
The Child and Adolescent Trial for Cardiovascular Health (CATCH) is a multisite intervention research study that builds on significant progress made in school health education research in the 1980s. The study has three phases: Phase I deals with study design, intervention, and measurement development, Phase II involves the main trial in 96 schools in four states, and Phase III focuses on analysis. The intervention program targets third-fifth grade students and focuses on multiple cardiovascular health behaviors, including eating habits, physical activity, and cigarette smoking. Classroom curricula, school environmental change, and family involvement programs are developed for each grade level and behavioral focus. This paper describes Phase II of CATCH with a rationale for cardiovascular health promotion with youth. The process of change that appears to be necessary for school-based health promotion and that will be tested in CATCH are presented as a framework to guide these efforts.  相似文献   
65.
66.
67.
68.
69.
70.
Advancing age is associated with a remarkable number of changes in body composition, including reduction in lean body mass and increase in body fat, which have been well documented. Decreased lean body mass occurs primarily as a result of losses in skeletal muscle mass. This age-related loss in muscle mass has been termed “sarcopenia”. Loss in muscle mass accounts for the age-associated decreases in basal metabolic rate, muscle strength, and activity levels, which, in turn are the cause of the decreased energy requirements of the elderly. In sedentary persons, the main determinant of energy expenditure is fat-free mass, which declines by about 15% between the third and eighth decade of life. It also appears that declining energy needs are not matched by an appropriate decline in energy intake, with the ultimate result being increased body fat content. Increased body fatness and increased abdominal obesity are thought to be directly linked to the greatly increased incidence of non-insulin-dependent diabetes mellitus among the elderly. In this review we will discuss the extent to which regularly performed exercise can affect nutrition needs and functional capacity in the elderly. We will also discuss a variety of concerns when prescribing exercise in the elderly, such as planning for a wide variability in functional status, medical status, and training intensity and duration. Finally, we will attempt to provide some basic guidelines for beginning an exercise program for older men and women and establishing community-based programs.  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