全文获取类型
收费全文 | 51331篇 |
免费 | 1861篇 |
国内免费 | 27篇 |
专业分类
53219篇 |
出版年
2020年 | 485篇 |
2019年 | 604篇 |
2018年 | 841篇 |
2017年 | 934篇 |
2016年 | 885篇 |
2015年 | 633篇 |
2014年 | 755篇 |
2013年 | 3922篇 |
2012年 | 1398篇 |
2011年 | 1530篇 |
2010年 | 988篇 |
2009年 | 962篇 |
2008年 | 1358篇 |
2007年 | 1303篇 |
2006年 | 1213篇 |
2005年 | 1051篇 |
2004年 | 971篇 |
2003年 | 999篇 |
2002年 | 991篇 |
2001年 | 1802篇 |
2000年 | 1759篇 |
1999年 | 1285篇 |
1998年 | 583篇 |
1997年 | 482篇 |
1992年 | 1082篇 |
1991年 | 1030篇 |
1990年 | 1033篇 |
1989年 | 955篇 |
1988年 | 929篇 |
1987年 | 925篇 |
1986年 | 898篇 |
1985年 | 964篇 |
1984年 | 771篇 |
1983年 | 627篇 |
1982年 | 504篇 |
1981年 | 490篇 |
1979年 | 797篇 |
1978年 | 600篇 |
1977年 | 553篇 |
1976年 | 506篇 |
1975年 | 725篇 |
1974年 | 754篇 |
1973年 | 790篇 |
1972年 | 676篇 |
1971年 | 579篇 |
1970年 | 538篇 |
1969年 | 627篇 |
1968年 | 702篇 |
1967年 | 625篇 |
1966年 | 673篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
971.
The five stages of family development and their phase-specific tasks as delineated by Michael A. Solomon in an article that appeared in this journal (1973) are given dramatic representation by Virginia Woolf in her novel To the Lighthouse (1927). The novel begins with the Ramsay family system arrested at the third stage of development; and it is only after the death of Mrs. Ramsay that the remaining family members begin to attend to the phase-specific tasks of stages four and five, and family development commences. 相似文献
972.
We begin our discussion by outlining the usefulness of "resource theory" as a theoretical framework for the study of family power. This framework is then used to analyze changes in the balance of power between elderly parents and their middle-age children. With respect to intergenerational power relationships, we argue that the autonomy of elderly parents has increased, but their power and influence over adult children has decreased. This trend is likely to continue in coming decades. Resource theory is then utilized to analyze changes in marital power relationships as couples age. Most studies of power relationships between elderly spouses have an important limitation--they tend to reflect yesterday's definitions of male and female roles. Recent changes in these roles may significantly alter the social meanings of aging for both men and women in coming years. 相似文献
973.
974.
This research examined the effects of structural complexity and sex of stepchild on the quality of stepfather-stepchild relationships. Sixteen simple stepfather families (the wife had custody of a child from a previous marriage, but the stepfather has no biological children) and 16 complex stepfather families (the wife had custody of a child from a previous marriage, and the stepfather was a noncustodial biological parent) with half of each type (N = 8) having a male and half having a female, 9-12-year-old target child participated in a multimethod-multimeasure assessment of the stepfather-stepchild relationship. Families were recruited from marriage license records, and data collection was accomplished in a single three-and-a-half-hour home visit. Dependent variables included: (a) questionnaire measures of love and detachment relationship dimensions independently obtained from parents, stepparents, and (step)children, and (b) proportions of positive and negative stepparent and stepchild communication behaviors derived from videotaped interaction tasks. Findings revealed that simple and complex stepfather families did not differ on any questionnaire or behavioral measures. Girls, however, engaged in a lower proportion of positive verbal and greater proportion of negative problem-solving behaviors toward their stepfathers than boys did. Stepfathers did not differ on proportions of communication behaviors emitted toward boys and girls. No sex-of-child differences were obtained on the questionnaire measures. Directions for future research on structural complexity and stepfather families are discussed. 相似文献
975.
976.
977.
978.
We investigated the programming of generalization and maintenance of correspondence between verbal and nonverbal behavior in a preschool setting. Four children participated in a series of multiple-baseline designs. In Experiment 1, delayed reinforcement of verbal behavior effectively controlled maintenance of correspondence with previously trained responses and also resulted in generalization of correspondence to one untrained response. As the latter effect was limited, Experiment 2 was a further assessment of the effects of delayed reinforcement of generalization of correspondence to untrained responses, and consistent generalization was shown. Experiment 2 also showed that generalization, if lost, could be recovered through use of "booster training," in which the original contingencies were reinstated for a brief period. Experiment 3 provided replications, with two additional children, of the effects of delayed reinforcement on maintenance of correspondence. Results are discussed in terms of using delayed reinforcement as an indiscriminable contingency. 相似文献
979.
980.