全文获取类型
收费全文 | 56492篇 |
免费 | 2363篇 |
国内免费 | 21篇 |
专业分类
58876篇 |
出版年
2020年 | 693篇 |
2019年 | 816篇 |
2018年 | 1153篇 |
2017年 | 1159篇 |
2016年 | 1222篇 |
2015年 | 875篇 |
2014年 | 1046篇 |
2013年 | 4913篇 |
2012年 | 1957篇 |
2011年 | 1965篇 |
2010年 | 1177篇 |
2009年 | 1202篇 |
2008年 | 1687篇 |
2007年 | 1660篇 |
2006年 | 1516篇 |
2005年 | 1256篇 |
2004年 | 1305篇 |
2003年 | 1246篇 |
2002年 | 1184篇 |
2001年 | 1928篇 |
2000年 | 1806篇 |
1999年 | 1353篇 |
1998年 | 635篇 |
1997年 | 542篇 |
1996年 | 618篇 |
1995年 | 559篇 |
1994年 | 552篇 |
1993年 | 533篇 |
1992年 | 1117篇 |
1991年 | 1026篇 |
1990年 | 1000篇 |
1989年 | 963篇 |
1988年 | 936篇 |
1987年 | 869篇 |
1986年 | 864篇 |
1985年 | 911篇 |
1984年 | 733篇 |
1983年 | 636篇 |
1982年 | 479篇 |
1979年 | 758篇 |
1978年 | 566篇 |
1975年 | 602篇 |
1974年 | 684篇 |
1973年 | 705篇 |
1972年 | 605篇 |
1971年 | 562篇 |
1970年 | 485篇 |
1968年 | 609篇 |
1967年 | 530篇 |
1966年 | 506篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
131.
J M Lewis 《Family process》1988,27(2):149-165
This article is the first of three that will present data from the Timberlawn Psychiatric Research Foundation Young Family Project, a study of the development over time of competent family systems. The Project is briefly described and findings are presented from the initial data collection period. The operational definitions of marital competence and the Continuum of Marital Competence are presented, and the data are interpreted to suggest that the spouses' levels of individual psychological health, their agreement on values, and their socioeconomic status are related to the level of marital competence. The level of prenatal marital competence at Time 1 is used as an independent variable with which to predict both changes in marital structure and incorporation of the child into the family system at 3 months and 1 year postpartum. The results of these analyses will be presented in two subsequent articles. 相似文献
132.
133.
134.
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
135.
General self-esteem of adolescents from ethnic minorities in The Netherlands and the reflected appraisal process 总被引:1,自引:0,他引:1
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
136.
137.
138.
139.
140.
Perlin E 《Journal of religion and health》1988,27(4):279-284
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