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   80453篇
  免费   2536篇
  国内免费   36篇
  2020年   768篇
  2019年   953篇
  2018年   4402篇
  2017年   3738篇
  2016年   3384篇
  2015年   1125篇
  2014年   1258篇
  2013年   5765篇
  2012年   2602篇
  2011年   4367篇
  2010年   3656篇
  2009年   2718篇
  2008年   3600篇
  2007年   3918篇
  2006年   1859篇
  2005年   1842篇
  2004年   1811篇
  2003年   1604篇
  2002年   1576篇
  2001年   1946篇
  2000年   1884篇
  1999年   1445篇
  1998年   850篇
  1997年   728篇
  1996年   613篇
  1995年   640篇
  1994年   627篇
  1993年   633篇
  1992年   1116篇
  1991年   1050篇
  1990年   1036篇
  1989年   943篇
  1988年   915篇
  1987年   901篇
  1986年   889篇
  1985年   938篇
  1984年   781篇
  1983年   670篇
  1982年   571篇
  1981年   534篇
  1980年   528篇
  1979年   756篇
  1978年   584篇
  1976年   538篇
  1975年   653篇
  1974年   697篇
  1973年   652篇
  1972年   575篇
  1968年   558篇
  1967年   557篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
941.
This study measured students' attitudes toward a university's student health services (SHS) and identified factors that were related to their attitudes. A questionnaire surveying students' attitudes was administered to a sample of 150 students at the Oxford Campus of the University of Mississippi. Analysis of the data revealed that students' attitudes had a statistically significant correlation with the following variables: perceived medical care cost, amount of health information/education received during medical encounters, time spent in the waiting room of the SHS, sex of the student, and income of the student. There was no significant relationship between attitude and age.  相似文献   
942.
The past fifteen years, in particular, have seen a major increase in the extent to which both adolescents and young adults are engaging in sexual intercourse. While several studies call attention to the increasing incidence among college/university students, the concomitant shifts in the sociopsychological realms of sexuality are also important dimensions which impact upon sexual concerns of youth. Hence, the purposes of this study are to examine the behaviors, attitudes, and concerns of students who have engaged in coitus, as well as any changes they seek in their sex lives. The sample consisted of 123 never-married male and 205 never-married female undergraduate students from a state university. The data were obtained by utilizing an anonymous questionnaire administered to volunteers during regular university classes. Among the coitally active, 67.4% of males were psychologically satisfied after their first sexual experience, but only 28.3% of females. In contrast, 80.9% of males and 28.3% of females reported current psychological satisfaction with their sexual experiences. Significant differences between genders focused on male dissatisfaction with infrequent opportunities for sexual intercourse, lack of variety of sex partners, and insufficient oral-genital stimulation, whereas females expressed concerns relating to lack of stimulation to their breasts, painful sexual intercourse, lack of orgasm during sexual intercourse, and feelings of guilt and fear. An increasing awareness of current sexual behaviors, attitudes, and concerns of university students can help family life educators to meet student needs as they react to changes in interpersonal relationships, families, and society.  相似文献   
943.
Adolescent alcoholism in Benin City, Nigeria   总被引:1,自引:0,他引:1  
O A Pela 《Adolescence》1986,21(82):487-492
The consumption of alcohol by Nigerian adolescents is investigated. Adolescence and alcoholism as applied in this study are defined, and the financial costs and physical and mental effects of alcohol use are described. The author used unobtrusive methods to gather data, visiting three nightclubs and an amusement park where alcohol is served in order to observe and interview adolescents. The findings show that adolescents begin drinking at an early age and consume large quantities of beer. The findings are consistent with those of other epidemiological studies. Finally, recommendations for controlling adolescent alcohol use are made.  相似文献   
944.
945.
946.
947.
948.
949.
950.
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