全文获取类型
收费全文 | 17157篇 |
免费 | 186篇 |
国内免费 | 17篇 |
专业分类
教育 | 11555篇 |
科学研究 | 2482篇 |
各国文化 | 174篇 |
体育 | 1272篇 |
综合类 | 9篇 |
文化理论 | 178篇 |
信息传播 | 1690篇 |
出版年
2021年 | 162篇 |
2020年 | 287篇 |
2019年 | 412篇 |
2018年 | 484篇 |
2017年 | 502篇 |
2016年 | 439篇 |
2015年 | 290篇 |
2014年 | 376篇 |
2013年 | 3237篇 |
2012年 | 397篇 |
2011年 | 391篇 |
2010年 | 332篇 |
2009年 | 314篇 |
2008年 | 348篇 |
2007年 | 340篇 |
2006年 | 292篇 |
2005年 | 301篇 |
2004年 | 267篇 |
2003年 | 266篇 |
2002年 | 254篇 |
2001年 | 270篇 |
2000年 | 280篇 |
1999年 | 223篇 |
1998年 | 147篇 |
1997年 | 175篇 |
1996年 | 197篇 |
1995年 | 139篇 |
1994年 | 167篇 |
1993年 | 154篇 |
1992年 | 210篇 |
1991年 | 197篇 |
1990年 | 206篇 |
1989年 | 212篇 |
1988年 | 178篇 |
1987年 | 160篇 |
1986年 | 209篇 |
1985年 | 212篇 |
1984年 | 184篇 |
1983年 | 185篇 |
1982年 | 163篇 |
1981年 | 134篇 |
1980年 | 141篇 |
1979年 | 181篇 |
1978年 | 164篇 |
1977年 | 130篇 |
1976年 | 126篇 |
1975年 | 97篇 |
1974年 | 121篇 |
1973年 | 102篇 |
1971年 | 116篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
991.
992.
Michel Ferrari Michelene T. H. Chi 《International Journal of Science Education》2013,35(10):1231-1256
Unlike some pivotal ideas in the history of science, the basic notion of natural selection is remarkably simple and so one might expect most students to easily grasp the basic principles of the Darwinian theory; yet many students nevertheless have difficulty understanding Darwinian evolution. We suggest that misconceptions about natural selection arise from mistaken categorization. Our thesis for explaining students’ failure to understand this concept or evolution in general is not that they necessarily fail to understand individual Darwinian principles; rather, they often fail to understand the ontological features of equilibration processes, of which evolution is one instance. They thus attribute the evolutionary process in general, and natural selection in particular, with event‐like properties. For example, naive students appear to focus on the idea of survival of the fittest, but embed this idea within an event ontology that involves actors struggling to overcome obstacles and achieve goals. Results showed that most naive subjects’ evolutionary explanations reflected an event ontology. Furthermore, event ontology attributes were positively correlated with non‐Darwinian explanations; by contrast, equilibration attributes, when present, were positively correlated with key Darwinian principles. These findings suggest that students would greatly benefit from science instruction that emphasized the underlying ontology of modern evolutionary theory. 相似文献
993.
Materials and exercises that may be used to simulate some of the deficits that occur in vision, hearing, mobility, and manual dexterity with increased age or disability are described. How arthritis, stroke, glaucoma, cataracts, and yellowing of the lens of the eye may be simulated is explained. The demonstrations are appropriate for educating health care professionals in gerontology and geriatrics and have been used with students of all ages. 相似文献
994.
995.
Michael W. Huntsberger Ph.D. 《广播与电子媒介杂志》2013,57(4):644-645
996.
997.
Findings from a survey of policy professionals in aging (n = 114) and experience with a demonstration program to train policy gerontologists indicates that (1) the demand for policy gerontologists is moderately high; (2) training requirements include specific skills training in political processes, communication, analysis, and administration; (3) policy gerontologists require such personal attributes as follow through, initiative, and innovation; and (4) knowledge of the content of specific policy areas as well as an understanding of the policy‐making process is important. Findings have been used to develop a model curriculum for training policy gerontologists which is presented and discussed. 相似文献
999.
1000.