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   56601篇
  免费   2361篇
  国内免费   21篇
  2020年   689篇
  2019年   804篇
  2018年   1154篇
  2017年   1157篇
  2016年   1217篇
  2015年   866篇
  2014年   1052篇
  2013年   4917篇
  2012年   1962篇
  2011年   1958篇
  2010年   1178篇
  2009年   1201篇
  2008年   1691篇
  2007年   1662篇
  2006年   1517篇
  2005年   1258篇
  2004年   1304篇
  2003年   1242篇
  2002年   1191篇
  2001年   1937篇
  2000年   1806篇
  1999年   1353篇
  1998年   624篇
  1997年   537篇
  1996年   615篇
  1995年   556篇
  1994年   550篇
  1993年   532篇
  1992年   1110篇
  1991年   1022篇
  1990年   1004篇
  1989年   967篇
  1988年   942篇
  1987年   867篇
  1986年   865篇
  1985年   912篇
  1984年   744篇
  1983年   638篇
  1979年   765篇
  1978年   567篇
  1975年   615篇
  1974年   699篇
  1973年   708篇
  1972年   612篇
  1971年   564篇
  1970年   491篇
  1969年   487篇
  1968年   618篇
  1967年   541篇
  1966年   515篇
排序方式: 共有10000条查询结果,搜索用时 147 毫秒
191.
192.
193.
194.
195.
196.
J M Lewis 《Family process》1988,27(3):273-283
At 1 year postpartum, 22 of 38 couples demonstrated the same level of marital competence as they had prenatally, 14 couples demonstrated deterioration in their marital relationship, and 2 couples were improved. At each of four levels of marital competence, there was a trend for the couples to demonstrate the same relationship response to parenthood. Highly competent relationships remained at high levels of competence. Competent but pained relationships were most vulnerable to regressive change in structure. Dominant-submissive, complementary relationships tended to remain stable at that level. Dominant-submissive, conflicted or severely conflicted relationships were most unpredictable and stability, regression, and improvement were seen. These findings are explored for possible correlations and are discussed from the perspective of several current models of family development.  相似文献   
197.
The transition to parenthood: I. The rating of prenatal marital competence   总被引:1,自引:0,他引:1  
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   
198.
199.
200.
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   
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