全文获取类型
收费全文 | 22227篇 |
免费 | 237篇 |
国内免费 | 32篇 |
专业分类
教育 | 15930篇 |
科学研究 | 2326篇 |
各国文化 | 109篇 |
体育 | 1555篇 |
综合类 | 23篇 |
文化理论 | 209篇 |
信息传播 | 2344篇 |
出版年
2021年 | 161篇 |
2020年 | 241篇 |
2019年 | 373篇 |
2018年 | 1125篇 |
2017年 | 1181篇 |
2016年 | 896篇 |
2015年 | 357篇 |
2014年 | 466篇 |
2013年 | 3345篇 |
2012年 | 521篇 |
2011年 | 789篇 |
2010年 | 620篇 |
2009年 | 476篇 |
2008年 | 644篇 |
2007年 | 668篇 |
2006年 | 434篇 |
2005年 | 360篇 |
2004年 | 400篇 |
2003年 | 332篇 |
2002年 | 308篇 |
2001年 | 414篇 |
2000年 | 425篇 |
1999年 | 353篇 |
1998年 | 207篇 |
1997年 | 236篇 |
1996年 | 243篇 |
1995年 | 224篇 |
1994年 | 182篇 |
1993年 | 193篇 |
1992年 | 297篇 |
1991年 | 274篇 |
1990年 | 259篇 |
1989年 | 294篇 |
1988年 | 304篇 |
1987年 | 252篇 |
1986年 | 271篇 |
1985年 | 277篇 |
1984年 | 241篇 |
1983年 | 284篇 |
1982年 | 218篇 |
1981年 | 193篇 |
1980年 | 182篇 |
1979年 | 277篇 |
1978年 | 225篇 |
1977年 | 198篇 |
1976年 | 188篇 |
1975年 | 155篇 |
1974年 | 148篇 |
1973年 | 156篇 |
1971年 | 130篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
Educational game designers and educators are using digital games as a platform for teaching academic content, including multicultural curriculum. However, it is unclear how well digital game-based learning can coexist with the goals of multicultural education for the purpose of meeting the needs of African American children. In this essay, we raise serious questions about the use of digital games to teach about social oppression in ways that privilege the psychological well-being of African American children. We argue that digital games that intend to recreate histories of racial oppression can be harmful to African American children if they reproduce popular and problematic notions of indigenous lives and experiences. We illuminate some of the dangers of such digital games through a preliminary exploration of one digital game designed to teach about facets of African American enslavement. Our essay concludes with recommendations for culturally relevant digital game-based learning design and instruction. 相似文献
952.
Lakshmi Krishnamoorthy Elizabeth Zachariah P. G. Ramaswamy N. Anantha 《Indian journal of clinical biochemistry : IJCB》1994,9(1):37-39
Circulating levels of gonadotropins (FSH,LH), prolactin (PRL), estradiol and progesterone were measured by radioimmunoassay
in the sera of 60 patients with histopathologically proven breast cancer. 30 patients belonged to the post and 30 to the premenopausal
group. 30 healthy women, 15 each in the pre and post menopausal groups served as controls for the study.
Prolactin was elevated in 33% and 26% of pre and post menopausal breast cancer patients respectively. Lower levels of estradiol
and progesterone were observed during the luteal phase of the menstrual cycle in premenopausal breast cancer patients. Among
postmenopausal patients with breast cancer, LH was elevated in 32%, FSH in 15% and estradiol in 30% of the patients studied. 相似文献
953.
Rats were exposed to two compound solutions, saline-lemon and sucrose-lemon. In Group ALT, trials with one solution alternated
with trials with the other. Group BLK received all trials with one solution before any trials with the other. Previous retardation
tests had implied that only alternating exposure would establish sucrose as an inhibitor of saline. To provide a complementary
summation test for this inhibition, in Experiment 1, all the animals received pairings of peppermint and saline and were tested
for consumption of peppermint-sucrose under sodium depletion. Consumption was increased by sodium depletion only in Group
BLK. In Experiment 2, a retardation test was used to show that presentation of saline-lemon before sucrose-lemon on each exposure
day would establish sucrose as an inhibitor of saline. Neither exposure to sucrose-lemon before saline-lemon nor alternating
exposure to sucrose and saline alone had the same effect. These results provide support for an associative theory of perceptual
learning that suggests that exposure to complex stimuli aids later discrimination partially as a result of establishing inhibitory
associations between their unique elements. 相似文献
954.
955.
日本的国家级教育政策研究机构包括国家级政府主导的公务机关性质的教育政策研究机构、独立行政法人性质的教育政策研究机构和大学或大学附属性质的教育政策研究机构。为了更有助于国家层面教育政策的整体规划和深度推进,日本文部科学省对原有的国家级教育政策研究机构进行了改革重组,强化了其服务于政府宏观教育决策的职能。以代表日本国家级教育政策研究机构的国立教育政策研究所为例,改革后其职能为:准确恰当并且迅速地应对教育行政上的诸多课题;回应教育基层实践的要求,进行全面综合地调查研究;向教育相关者提供教育研究情报信息;开展教育领域的国际性的共同研究;推进与地方政府的教育研究所或研究中心等的共同研究。日本国家级教育政策研究机构的改革与发展,为我国教育政策研究的科学化发展提供了参考和启示。 相似文献
956.
Laaksonen T Sariola H Johansson A Jern P Varjonen M von der Pahlen B Sandnabba NK Santtila P 《Child abuse & neglect》2011,35(7):480-490
Objective
We examined (1) the prevalence of childhood sexual abuse (CSA) experiences as a function of cohort and gender, (2) the prevalence of factors associated with CSA as a function of cohort and whether the association of these factors with CSA remained the same irrespective of cohort, and (3) whether any cohort differences could be explainable by cohort differences in reporting bias.Method
We used the responses of 4,561 men (M = 29, SD = 7 years) and 8,361 female (M = 29, SD = 7 years) Finnish participants who responded to the Childhood Trauma Questionnaire-Short Form as well as questions regarding family structure.Results
The prevalence of CSA experiences varied between 0.7-4.6% for men and 1.8-7.5% for women depending on the item. Younger cohorts reported less CSA as well as less of the risk factors (physical neglect and abuse, emotional neglect and abuse, parental substances abuse, not growing up with both biological parents) that were positively associated with the likelihood of CSA. The effects of these risk factors did not vary as a function of the cohort. Also, the declining trend was not explainable by social desirability being higher in the younger cohorts.Conclusions
The results suggest that there is a real decline in the prevalence of CSA and it is associated with a simultaneous decline in factors associated with CSA. 相似文献957.
958.
A nationwide purposive sample of secondary vocational educators completed a questionnaire that examined practices and perceptions toward grading students with disabilities. A variety of grading methods was reportedly used, but over two-thirds of respondents included a competency-based grading component. An overwhelming majority believed that student effort should be used to determine grades. Two-thirds of vocational educators had never been involved in their students' IEP development. The most common changes teachers have made over time in their grading practices included becoming more flexible and individualized in grading. Overall, teachers displayed moderately positive attitudes toward grading students with disabilities. 相似文献
959.
Julia D. Plummer Valerie M. Zahm Rebecca Rice 《Journal of Science Teacher Education》2010,21(4):471-493
This study investigated the impact of an open inquiry experience on elementary science methods students’ understanding of
celestial motion as well as the methods developed by students to answer their own research questions. Pre/post interviews
and assessments were used to measure change in participants’ understanding (N = 18). A qualitative approach was used to describe the nature of each participant’s investigation through an analysis of
their science journal and poster presentations. A comparison of participants’ inquiry projects with the change in their understanding
revealed that while most participants improved in both their area of inquiry and beyond, elementary science methods students
may need more guidance to reach a full scientific understanding across all aspects of celestial motion. 相似文献
960.
This article examines social integration of deaf children in inclusive settings in The Netherlands. Eighteen Grade 1-5 deaf children and their 344 hearing classmates completed 2 sociometric tasks, peer ratings and peer nomination, to measure peer acceptance, social competence, and friendship relations. Deaf and hearing children were found to be similar in their peer acceptance and friendship relations, but differences occurred in social competence. Deaf children scored lower than hearing children on prosocial behavior and higher on socially withdrawn behavior. Structural equation modeling showed peer acceptance, social competence, and friendship relations to be stable over time, and the structure of interrelations between variables at 2 measurements were found to be the same for deaf and hearing participants. 相似文献