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   36730篇
  免费   7034篇
  国内免费   153篇
耳鼻咽喉   773篇
儿科学   1248篇
妇产科学   1088篇
基础医学   2231篇
口腔科学   2785篇
临床医学   6454篇
内科学   7964篇
皮肤病学   622篇
神经病学   3439篇
特种医学   1281篇
外科学   5316篇
综合类   247篇
现状与发展   12篇
一般理论   16篇
预防医学   4968篇
眼科学   710篇
药学   1090篇
中国医学   17篇
肿瘤学   3656篇
  2024年   147篇
  2023年   1204篇
  2022年   554篇
  2021年   1161篇
  2020年   1532篇
  2019年   984篇
  2018年   1849篇
  2017年   1656篇
  2016年   1897篇
  2015年   1972篇
  2014年   2531篇
  2013年   3238篇
  2012年   1994篇
  2011年   2088篇
  2010年   2048篇
  2009年   2526篇
  2008年   1774篇
  2007年   1571篇
  2006年   1675篇
  2005年   1391篇
  2004年   1146篇
  2003年   1091篇
  2002年   934篇
  2001年   501篇
  2000年   362篇
  1999年   489篇
  1998年   637篇
  1997年   582篇
  1996年   600篇
  1995年   464篇
  1994年   370篇
  1993年   318篇
  1992年   241篇
  1991年   209篇
  1990年   192篇
  1989年   197篇
  1988年   175篇
  1987年   171篇
  1986年   146篇
  1985年   134篇
  1984年   120篇
  1983年   129篇
  1982年   121篇
  1981年   109篇
  1980年   90篇
  1979年   77篇
  1978年   65篇
  1977年   64篇
  1976年   58篇
  1974年   50篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
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   
92.
93.
94.
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   
95.
96.
97.
98.
99.
100.
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