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   56087篇
  免费   2351篇
  国内免费   21篇
  2020年   681篇
  2019年   796篇
  2018年   1134篇
  2017年   1153篇
  2016年   1208篇
  2015年   859篇
  2014年   1041篇
  2013年   4871篇
  2012年   1940篇
  2011年   1944篇
  2010年   1161篇
  2009年   1196篇
  2008年   1680篇
  2007年   1639篇
  2006年   1498篇
  2005年   1239篇
  2004年   1294篇
  2003年   1237篇
  2002年   1174篇
  2001年   1929篇
  2000年   1802篇
  1999年   1351篇
  1998年   620篇
  1997年   535篇
  1996年   610篇
  1995年   552篇
  1994年   544篇
  1993年   533篇
  1992年   1108篇
  1991年   1023篇
  1990年   999篇
  1989年   961篇
  1988年   940篇
  1987年   864篇
  1986年   863篇
  1985年   906篇
  1984年   731篇
  1983年   635篇
  1979年   761篇
  1978年   565篇
  1975年   606篇
  1974年   682篇
  1973年   702篇
  1972年   606篇
  1971年   561篇
  1970年   483篇
  1969年   481篇
  1968年   609篇
  1967年   531篇
  1966年   506篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
201.
202.
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   
203.
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   
204.
205.
206.
207.
208.
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   
209.
210.
Survey respondents may inaccurately report mental health service utilization for motivational and cognitive reasons. There is little evidence on accuracy of self-reports of mental health service use, and this evidence suggests that respondents tend to underreport inpatient utilization. This study addressed the question of self-report accuracy by comparing survey data from a large probability sample to data from computerized records of publicly funded mental health services. Few inaccuracies in self-reporting were detected. However, despite the use of data bases that were unusually appropriate for verifying self-reports, several problems limited the feasibility of validation. Suggestions are offered for increasing the feasibility of validation in future studies.  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