全文获取类型
收费全文 | 12112篇 |
免费 | 179篇 |
国内免费 | 8篇 |
专业分类
教育 | 8588篇 |
科学研究 | 1140篇 |
各国文化 | 366篇 |
体育 | 807篇 |
综合类 | 6篇 |
文化理论 | 70篇 |
信息传播 | 1322篇 |
出版年
2021年 | 129篇 |
2020年 | 165篇 |
2019年 | 243篇 |
2018年 | 308篇 |
2017年 | 343篇 |
2016年 | 321篇 |
2015年 | 221篇 |
2014年 | 281篇 |
2013年 | 2206篇 |
2012年 | 280篇 |
2011年 | 275篇 |
2010年 | 241篇 |
2009年 | 264篇 |
2008年 | 326篇 |
2007年 | 298篇 |
2006年 | 239篇 |
2005年 | 240篇 |
2004年 | 273篇 |
2003年 | 188篇 |
2002年 | 167篇 |
2001年 | 205篇 |
2000年 | 236篇 |
1999年 | 215篇 |
1998年 | 125篇 |
1997年 | 124篇 |
1996年 | 120篇 |
1995年 | 107篇 |
1994年 | 106篇 |
1993年 | 119篇 |
1992年 | 190篇 |
1991年 | 180篇 |
1990年 | 177篇 |
1989年 | 174篇 |
1988年 | 137篇 |
1987年 | 134篇 |
1986年 | 133篇 |
1985年 | 175篇 |
1984年 | 147篇 |
1983年 | 137篇 |
1982年 | 111篇 |
1981年 | 105篇 |
1980年 | 105篇 |
1979年 | 155篇 |
1978年 | 100篇 |
1977年 | 98篇 |
1976年 | 91篇 |
1975年 | 86篇 |
1974年 | 97篇 |
1973年 | 81篇 |
1971年 | 83篇 |
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
212.
Lunzer reported data suggestive of a stage of cognitive development manifest between 9 and 11 years of age characterized by the ability to avoid drawing premature inferences when faced with ambiguity (i.e., accept lack of closure [ALC]). The present study sought to test this hypothesis. Inference tasks emphasizing ALC, memory, and hypothetico-deductive reasoning were administered to 67 males and 74 females (5-12 years in age). Although use of ALC increased with age, considerable use was evidenced on a simple task among 7-8-year-olds. On tasks hypothesized to place increasing demands on working memory, longer tasks were found to be more difficult. Marked improvement due to memory aids suggested that task difficulty results from limitations in working memory as predicted by Pascual-Leone's theory. Tasks requiring hypothetico-deductive reasoning were found to be most difficult. Performance was related to subject's spontaneous use of ALC. Lack of appropriate strategies was hypothesized to prevent solution rather than lack of logical competence. In conclusion, the relationship of ALC to age appears to be mediated by memory development rather than logical development. 相似文献
213.
214.
Compliance and Comprehension in Very Young Toddlers 总被引:1,自引:0,他引:1
We studied the relation of compliance with comprehension in 30 toddlers, 10 each at 12–13, 14–16, and 17–18 months of age. Requests, using preselected words, were made to children in the context of a naturalistic and pleasant play situation in a quasilaboratory setting. Detailed coding systems were used to define comprehension, compliance, and patterns of compliance-comprehension, noncompliance-comprehension, compliance-noncomprehension, and noncompliance-noncomprehension at each age period. Findings indicated significant shifts in the categories of compliance-comprehension and noncompliance-noncomprehension across the 3 ages, with the most striking change occurring between 14–16 and 17–18 months. Implications of the data are discussed. 相似文献
215.
216.
The nature and correlates of underachievement among elementary schoolchildren in Hong Kong 总被引:2,自引:0,他引:2
This study investigated for the first time several characteristics of underachievement in a large sample of Hong Kong elementary schoolchildren. More males were identified as underachievers than females, but the ratio was substantially less than the two-to-one rate typically found in the American literature. The stability and persistence of underachievement increased during the elementary school years, and the stability of underachievement tended to be higher in subject matter that was relatively more difficult, which varied with gender. Underachievement became more specific to particular academic subjects rather than more general across the elementary grades. Parents and teachers, but not the children themselves, perceived that underachievers were more capable than same-grade nonunderachievers (who score lower on ability tests), although this awareness is more likely directed at male than female underachievers, which has been observed in other samples. In grades 1-4, teachers provided extra mentoring, communications, and support to underachievers. Thereafter, underachievers became more disruptive, impatient, and aggressive in school and perhaps at home. At that point, teachers became less supportive, offered less extra mentoring, and applied greater behavioral control over underachievers. Underachieving children also perceived that their parents became less supportive and used more discipline in grades 5-6 relative to grades 3-4. These correlates of underachievement suggests the existence of a syndrome of underachievement that separates underachievers from children who have the same grades but lower mental ability. 相似文献
217.
N B Guterman 《Child abuse & neglect》1999,23(9):863-890
OBJECTIVE: Seeking to discern optimal programmatic strategies and inform the "universal versus targeted" debate in early home visitation services to prevent physical child abuse and neglect, a meta-analysis was conducted examining enrollment approaches in early home visitation studies and their reported outcomes. METHOD: Quantitative meta-analytic techniques were used to compare effect sizes from 19 controlled outcome studies across screening-based and population-based enrollment strategies. Effect sizes were calculated on protective services data and on child maltreatment related measures of parenting. RESULTS: On protective services report data, population-based studies reported a weighted mean effect size attributable to early home visitation of +3.72%, in comparison to -.07% for screening-based studies. On child maltreatment related measures of parenting, population-based studies reported a weighted mean effect size (r) attributable to early home visitation of +.092, in comparison to +.020 for screening-based studies. CONCLUSIONS: The findings indicate that population-based enrollment strategies appear favorable to screening-based ones in early home visitation programs seeking to prevent physical child abuse and neglect. It may be that psychosocial risk screens serve to enroll higher proportions of families for which early home visitation services are less likely to leverage change, and to exacerbate a mismatch between early home visitation service aims and family needs. 相似文献
218.
219.
This study evaluated the emotional and marital adjustment of hearing parents of hearing-impaired youths. Participants included mothers and fathers of hearing-impaired youths and mothers and fathers of hearing youths. In contrast with expectations based on clinical impressions reported in the literature, parents of hearing-impaired youths reported less symptomatology than did parents of hearing youths, and there were no differences in the marital satisfaction of parents in intact families. Moreover, parental adjustment was not associated with the duration of time since the child was diagnosed as hearing impaired. In addition, hierarchical multiple regression analyses revealed that family cohesion was associated with low maternal symptomatology and high marital satisfaction for both spouses. For mothers, low symptomatology was associated with low stress and female gender of child; high marital satisfaction also was linked with a less severe degree of hearing loss in the youth. 相似文献
220.
Duane B. Starcher 《Learning, Media and Technology》1981,7(2):45-47
Memorial University has been active in the use of educational media since its creation, and operates a public channel, initially broadcast through CBC but now on cable distribution. The author discusses the changes that have occurred over the past few years in the role of television there and describes the interactive element called PLA YBA CK, through which viewers can now access any of 1000 programmes by a telephone call to the control room. The reader is invited to consider the changes in philosophy such developments inevitably entail. 相似文献