全文获取类型
收费全文 | 17436篇 |
免费 | 223篇 |
国内免费 | 25篇 |
专业分类
教育 | 12280篇 |
科学研究 | 1527篇 |
各国文化 | 248篇 |
体育 | 1613篇 |
综合类 | 9篇 |
文化理论 | 222篇 |
信息传播 | 1785篇 |
出版年
2022年 | 100篇 |
2021年 | 141篇 |
2020年 | 264篇 |
2019年 | 378篇 |
2018年 | 516篇 |
2017年 | 554篇 |
2016年 | 500篇 |
2015年 | 367篇 |
2014年 | 447篇 |
2013年 | 3431篇 |
2012年 | 419篇 |
2011年 | 414篇 |
2010年 | 372篇 |
2009年 | 333篇 |
2008年 | 442篇 |
2007年 | 394篇 |
2006年 | 362篇 |
2005年 | 335篇 |
2004年 | 288篇 |
2003年 | 343篇 |
2002年 | 299篇 |
2001年 | 283篇 |
2000年 | 272篇 |
1999年 | 261篇 |
1998年 | 172篇 |
1997年 | 180篇 |
1996年 | 219篇 |
1995年 | 196篇 |
1994年 | 209篇 |
1993年 | 178篇 |
1992年 | 260篇 |
1991年 | 248篇 |
1990年 | 238篇 |
1989年 | 226篇 |
1988年 | 191篇 |
1987年 | 185篇 |
1986年 | 202篇 |
1985年 | 206篇 |
1984年 | 167篇 |
1983年 | 203篇 |
1982年 | 176篇 |
1981年 | 180篇 |
1980年 | 171篇 |
1979年 | 240篇 |
1978年 | 164篇 |
1977年 | 154篇 |
1976年 | 157篇 |
1975年 | 119篇 |
1974年 | 126篇 |
1971年 | 105篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
991.
992.
Government‐sponsored student loans have emerged over the decades as a primary method of financing post‐secondary education across most North American jurisdictions. Despite this, the empirical literature examining the correlates of repayment difficulty and default in Canada has remained stagnant in recent years. This study taps into an underutilised data source—the 2013 National Graduates Survey—to examine the relationship between demographics, human capital, borrowing behaviour and other known predictors and repayment difficulty. Our logistic regression models demonstrate that disability status, geographic region and borrowing behaviour are correlated with loan default and repayment difficulty, while failing to verify the existence of other demographic effects routinely found in the existing literature. We discuss the implications of these findings, along with multiple avenues for further empirical work on this topic within Canada. 相似文献
993.
994.
Narae Ju Natalie Williams Julie Sedivy Craig G. Chambers Susan A. Graham 《Child development》2023,94(5):1319-1329
This study examined 4- and 5-year-olds' incremental interpretation of size adjectives, focusing on whether contrastive inferences are modulated by speaker behavior. Children (N = 120, 59 females, mostly White, tested between July, 2018 and August, 2019) encountered either a conventional or unconventional speaker who labeled objects in a correspondingly typical or atypical way. Critical utterances contained size adjectives (e.g., “Look at the big duck”). With conventional speakers, gaze measures indicated that children rapidly used the adjective to differentiate members of a contrasting pair, indicating that even 4-year-olds derive contrastive inferences. With unconventional speakers, contrastive inferences were delayed in processing. The findings demonstrate that preschoolers adjust their use of pragmatic cues when presented with evidence disconfirming their default assumptions about a speaker. 相似文献
995.
996.
997.
998.
Edy H. M. Shahali Lilia Halim David F. Treagust Mihye Won A. L. Chandrasegaran 《Research in Science Education》2017,47(2):257-281
This study investigated the understanding of science process skills (SPS) of 329 science teachers from 52 primary schools selected by random sampling. The understanding of SPS was measured in terms of conceptual and operational aspects of SPS using an instrument called the Science Process Skills Questionnaire (SPSQ) with a Cronbach’s alpha reliability of 0.88. The findings showed that the teachers’ conceptual understanding of SPS was much weaker than their practical application of SPS. The teachers’ understanding of SPS differed by their teaching qualifications but not so much by their teaching experience. Emphasis needs to be given to both conceptual and operational understanding of SPS during pre-service and in-service teacher education to enable science teachers to use the skills and implement inquiry-based lessons in schools. 相似文献
999.
Sarah B. Laditka Carol L. Jenkins G. Paul Eleazer Susan G. Kelsey 《Educational gerontology》2013,39(6):469-482
This study examined non-geriatrician physicians' experiences in a geriatrics-focused faculty development program, and effects of the program on their geriatrics knowledge and their teaching and practice. In-depth interviews were conducted with all physicians (n = 26) participating in the Dean's Faculty Scholars in Aging program. Most participants reported substantial gains in geriatric knowledge, and in the knowledge that older people are a distinct group with special needs. Most reported substantial changes in the way they care for older patients. Most reported incorporating notably more geriatrics content into their teaching. The program may serve as a process to address the growing need for physicians with geriatric knowledge. 相似文献
1000.
Regi Jose G. R. Sajitha K. T. Augusti 《Indian journal of clinical biochemistry : IJCB》2014,29(2):119-132
Nutraceuticals are nutritional medicines which are present in edible food items. Most of them are antioxidants with various other biological properties viz, anti inflammatory, anti atherogenic, anticancer, anti viral, anti aging properties etc. They are as simple as minerals like Se2+ to complex organic molecules such as glycyrrhizin (Ca2+, K+ salts of glycyrrhizic acid). They can prevent as well as cure various diseases. Most of the medical people are not aware of the importance of the nutraceuticals as such matters are not part of their text books. Many still think that vitamins are the major nutritional medicines. Actually other dietary principles like terpenes, carotenes, phytosterols, polyphenols, flavanoids, di and poly sulphides, their sulfoxides and their precursor amino acids are necessary to scavenge free radicals in the body which are reactive oxygen species to protect and maintain the vitamin levels in the body. They down regulate the activities of those enzymes which are increased in diseases and they increase those that remove oxidants and detoxify carcinogens. They are immune boosters too. Recently glucosinolates, non toxic alkaloids, certain proteins and even fiber are included in the list of nutraceuticals. 相似文献