全文获取类型
收费全文 | 33138篇 |
免费 | 357篇 |
国内免费 | 26篇 |
专业分类
教育 | 22791篇 |
科学研究 | 3838篇 |
各国文化 | 330篇 |
体育 | 2893篇 |
综合类 | 12篇 |
文化理论 | 279篇 |
信息传播 | 3378篇 |
出版年
2021年 | 313篇 |
2020年 | 479篇 |
2019年 | 715篇 |
2018年 | 963篇 |
2017年 | 892篇 |
2016年 | 823篇 |
2015年 | 530篇 |
2014年 | 707篇 |
2013年 | 6010篇 |
2012年 | 679篇 |
2011年 | 717篇 |
2010年 | 556篇 |
2009年 | 584篇 |
2008年 | 612篇 |
2007年 | 593篇 |
2006年 | 543篇 |
2005年 | 488篇 |
2004年 | 503篇 |
2003年 | 415篇 |
2002年 | 440篇 |
2001年 | 589篇 |
2000年 | 641篇 |
1999年 | 556篇 |
1998年 | 331篇 |
1997年 | 326篇 |
1996年 | 400篇 |
1995年 | 310篇 |
1994年 | 333篇 |
1993年 | 301篇 |
1992年 | 445篇 |
1991年 | 480篇 |
1990年 | 444篇 |
1989年 | 492篇 |
1988年 | 431篇 |
1987年 | 422篇 |
1986年 | 457篇 |
1985年 | 484篇 |
1984年 | 407篇 |
1983年 | 407篇 |
1982年 | 337篇 |
1981年 | 326篇 |
1980年 | 347篇 |
1979年 | 463篇 |
1978年 | 364篇 |
1977年 | 325篇 |
1976年 | 282篇 |
1975年 | 248篇 |
1974年 | 279篇 |
1973年 | 259篇 |
1971年 | 249篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Robert J. Jones Ph.D. Kenneth J. Gruber Ph.D. Gary D. Timbers Ph.D. 《Child abuse & neglect》1981,5(4):431-440
This study reports the results of extensive interviews with an intact sample of moderately delinquent adolescents concerning their sexual assault histories. Findings indicate a surprisingly high incidence of victimization among the females interviewed which, the authors suggest, may characterize the larger population of delinquent females. The behavioral-situational contexts of reported victimization experiences are examined for salient commonalities and the following composite rape scenerio can be cast from the data: An unsupervised, 14-year-old female, who has been consuming alcohol or marijuana, is sexually assaulted, following threat and/or force, to the point of penile-vaginal penetration, by an older male friend or acquaintance (who has also consumed alcohol or marijuana) in his home or vehicle or other place where she is inherently unprotected. Some comments are offered concerning the requirements of an effective technology of child rape prevention. 相似文献
992.
Sequence learning in pigeons was studied in asimultaneous chaining paradigm: all stimuli and the opportunity to respond to each stimulus were available simultaneously. In contrast to the traditionalsuccessive chaining paradigm, a simultaneous chaining paradigm provides no differential feedback following each response (except the last). Subjects were first trained to perform on sequences of two (AB), then three (ABC), and then four colors (ABCD). Performance greatly exceeded that predicted by models of random choice. Generalization to novel arrays of three and four colors was complete. After training with a four-color sequence, the subjects were tested with subsequences consisting of all possible combinations of two and three of the four training colors (e.g., BD, AD, BC, ACD, BCD, etc.). The successful completion of these subsequences showed that the organization of the original sequence did not entail overt pecks to successive elements of that sequence. That subjects can respond accurately on nonadjacent subsets is not readily explained by a chaining theory, or by any theory that assumes that responding to element n provides a cue for responding to element n+1. 相似文献
993.
J iang Gongjian 《零陵学院学报》1993,(3)
In this paper,we obtain Lipschitz-Nikolskii constants for the Baskakov operators V_n(f,x)。 相似文献
994.
Associations among adolescent attachment organization, maternal sensitivity, and infant attachment organization were examined prospectively in 74 teenaged mother-infant dyads. Pregnant teenagers' attachment organizations predicted both sensitivity and infant-mother attachments. Mothers classified autonomous (F) in the prenatal period showed higher levels of sensitivity at both 3 and 9 months than mothers classified dismissing (Ds), preoccupied (E), or unresolved (U). Correspondence between maternal attachment (F vs. Ds/E/U) and infant attachment (secure [B] vs. avoidant [A]/resistant [C]/ disorganized [D]) was observed in 58 of 74 (78%) dyads. Exact 4-group (Ds/E/F/U and A/B/C/D) agreement was observed in 50 of 74 (68%) families. In contrast, associations between maternal sensitivity and infant attachment were not significant, leading to questions about the processes that link attachment representations, maternal behavior, and infant attachment in adolescent mothers. 相似文献
995.
M. D. J. BARRY 《European Journal of Engineering Education》1995,20(3):335-339
The Australian Engineering Mathematics Conference is now a biennial event. In 1994, this took place in Melbourne, sponsored principally by Swinburne University of Technology. It attracted considerable international interest with many delegates coming from Europe. The paper summarises the proceedings. 相似文献
996.
997.
998.
Current developments in higher education strongly indicate that the way ahead in many disciplines is much closer co-operation between academia and industry. There is growing demand that recognition should be given to learning, irrespective of the environment in which it occurs.This article reflects on what are deemed to be essential components of a degree, and considers how they might be transformed into forms suitable for demonstration in the work environment. The discussion is supported by findings of a survey carried out in conjunction with a development - Structured Industrial Practice Studies - which integrates academic learning and learning in the work environment for full-time students. The findings, however, are of relevance beyond the particular model of learning and mode of attendance. There appears to be potential for achieving in the workplace aspects of courses which, in recent times, have been the prerogative of higher education establishments. However, such potential is variable between working environments and is dependent on higher education providers adapting to different structures in delivery. 相似文献
999.
1000.
Assessing Marital Conflict from the Child''s Perspective: The Children''s Perception of Interparental Conflict Scale 总被引:10,自引:0,他引:10
Guided by Grych and Fincham's theoretical framework for investigating the relation between interparental conflict and child adjustment, a questionnaire was developed to assess children's views of several aspects of marital conflict. The Children's Perception of Interparental Conflict Scale (CPIC) was initially examined in a sample of 222 9-12-year-old children, and results were cross-validated in a second sample of 144 similarly aged children. 3 factor analytically derived subscales (Conflict Properties, Threat, Self-Blame) demonstrated acceptable levels of internal consistency and test-retest reliability. The validity of the Conflict Properties scale was supported by significant relations with parent reports of conflict and indices of child adjustment; the Threat and Self-Blame scales correlated with children's responses to specific conflict vignettes. The CPIC thus appears to be a promising instrument for assessing perceived marital conflict, and several issues regarding its interpretation are discussed. 相似文献