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   65420篇
  免费   2615篇
  国内免费   23篇
  68058篇
  2020年   762篇
  2019年   923篇
  2018年   1265篇
  2017年   1288篇
  2016年   1377篇
  2015年   998篇
  2014年   1208篇
  2013年   5826篇
  2012年   2238篇
  2011年   2262篇
  2010年   1400篇
  2009年   1410篇
  2008年   1988篇
  2007年   1985篇
  2006年   1845篇
  2005年   1551篇
  2004年   1569篇
  2003年   1521篇
  2002年   1463篇
  2001年   2066篇
  2000年   1974篇
  1999年   1491篇
  1998年   774篇
  1997年   670篇
  1996年   748篇
  1995年   684篇
  1994年   679篇
  1993年   629篇
  1992年   1237篇
  1991年   1140篇
  1990年   1106篇
  1989年   1062篇
  1988年   1038篇
  1987年   982篇
  1986年   967篇
  1985年   1032篇
  1984年   854篇
  1983年   753篇
  1982年   632篇
  1981年   599篇
  1979年   871篇
  1978年   710篇
  1977年   604篇
  1976年   603篇
  1975年   730篇
  1974年   810篇
  1973年   829篇
  1972年   703篇
  1971年   628篇
  1968年   683篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
161.
162.
163.
Through school-sponsored health fairs, 398 adolescents (153 males and 245 females) between the ages of 14 and 18 completed a questionnaire on their compliance with six of the U.S. Dietary Guidelines. Results indicated that adolescents report highest compliance on "eat a variety of foods" and "eat foods with adequate starch and fiber." Conversely, they indicated low compliance on "reduce sugar intake" and "reduce fat, saturated fat and cholesterol intake." Sex differences were noted on two dietary guidelines. Females reported lower compliance with respect to "maintain desirable body weight." Males, on the other hand, reported lower compliance than females on "reduce salt intake." Given the fact that the dietary guidelines of "reduce fat, saturated fat and cholesterol," "maintain desirable body weight," and "reduce salt intake" are all aimed at reducing cardiovascular risk, the low compliance reported by adolescents may have long-range health implications.  相似文献   
164.
M Verkuyten 《Adolescence》1988,23(92):863-871
This article examines the question of how the lack of differences in general self-esteem between adolescents of ethnic minorities and Dutch adolescents can be explained. Attention is focused on the reflected appraisal process. It was found that for adolescents of ethnic minorities there is a significant relationship between general self-esteem and the perceived evaluation of family members, and no such relationship with nonfamily members. For the Dutch adolescents the findings are the opposite, which may explain why adolescents of ethnic minorities in general do not have lower general self-esteem, despite low status, prejudice, and discrimination.  相似文献   
165.
166.
167.
168.
169.
The care of the patient with cancer requires the development not only of a medical plan, but an ethical plan as well. This plan should integrate the physician's and the patient's perceptions of medical and ethical propriety. Jewish biomedical ethical principles are based on the teaching of the Old Testament and its various interpretations. In this paper, I discuss how these principles can be used to help guide the physician caring for the patient with cancer. Other ethical systems could be applied in a similar fashion.  相似文献   
170.
A frequently advocated strategy for increasing the efficiency of child abuse prevention programs is to deliver prevention services to "high-risk" populations. This article critically reviews procedures for the reliable and valid assessment of child abuse potential within an ecological perspective. Factors that limit the usefulness of child abuse risk assessment are discussed. These factors include the uncertain criteria of child abuse and neglect, the low base rate of the phenomenon, and the financial and social costs of such procedures. Finally, the prevention implications of the current and future state of the art in child abuse risk assessment are considered and preventive interventions that do not depend on individual case risk screening are advocated.  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