全文获取类型
收费全文 | 14056篇 |
免费 | 167篇 |
国内免费 | 7篇 |
专业分类
教育 | 10268篇 |
科学研究 | 1214篇 |
各国文化 | 81篇 |
体育 | 1111篇 |
综合类 | 7篇 |
文化理论 | 86篇 |
信息传播 | 1463篇 |
出版年
2021年 | 104篇 |
2020年 | 154篇 |
2019年 | 257篇 |
2018年 | 359篇 |
2017年 | 362篇 |
2016年 | 328篇 |
2015年 | 203篇 |
2014年 | 280篇 |
2013年 | 2597篇 |
2012年 | 298篇 |
2011年 | 363篇 |
2010年 | 226篇 |
2009年 | 217篇 |
2008年 | 324篇 |
2007年 | 232篇 |
2006年 | 303篇 |
2005年 | 198篇 |
2004年 | 186篇 |
2003年 | 175篇 |
2002年 | 214篇 |
2001年 | 320篇 |
2000年 | 291篇 |
1999年 | 260篇 |
1998年 | 128篇 |
1997年 | 157篇 |
1996年 | 172篇 |
1995年 | 175篇 |
1994年 | 139篇 |
1993年 | 161篇 |
1992年 | 234篇 |
1991年 | 210篇 |
1990年 | 209篇 |
1989年 | 245篇 |
1988年 | 245篇 |
1987年 | 205篇 |
1986年 | 204篇 |
1985年 | 217篇 |
1984年 | 189篇 |
1983年 | 229篇 |
1982年 | 170篇 |
1981年 | 159篇 |
1980年 | 158篇 |
1979年 | 232篇 |
1978年 | 182篇 |
1977年 | 164篇 |
1976年 | 149篇 |
1975年 | 130篇 |
1974年 | 119篇 |
1973年 | 125篇 |
1971年 | 107篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
121.
122.
Tolar TD Lederberg AR Gokhale S Tomasello M 《Journal of deaf studies and deaf education》2008,13(2):225-240
Early developmental psychologists viewed iconic representation as cognitively less complex than other forms of symbolic thought. It is therefore surprising that iconic signs are not acquired more easily than arbitrary signs by young language learners. One explanation is that children younger than 3 years have difficulty interpreting iconicity. The current study assessed hearing children's ability to interpret the meaning of iconic signs. Sixty-six 2.5- to 5-year-olds who had no previous exposure to signs were required to match iconic signs to pictures of referents. Whereas few of the 2.5-year-olds recognized the meaning of the iconic signs consistently, more than half of the 3.0-year-olds and most of 3.5-year-olds performed above chance. Thus, the ability to recognize the meaning of iconic signs gradually develops during the preschool years. Implications of these findings for sign language development, receptive signed vocabulary tests, and the development of the ability to interpret iconic symbols are discussed. 相似文献
123.
124.
1 Introduction Duringthe past several decades ,considerable atten-tion has been given to devising methods for solvingconstrained opti mization problemsviaunconstrainedmini mization techniques and a number of researchwork in the area of nonlinear programmi… 相似文献
125.
126.
127.
128.
The paper describes the design and use of a studio system which arose out of the need to give demonstrations of experimental procedures to practical classes of up to 150 students. Since the requirements could be specified in some detail it was possible to use novel methods of working which turned out to be very efficient and economical. 相似文献
129.
Willi Dörfler 《Educational Studies in Mathematics》2003,54(2-3):147-170
A broad view of mathematics education takes it as the study of how people learn and do mathematics. Starting with this view, the actual and potential relationships of mathematics education as are search discipline to mathematics as a field of knowledge and activity and to the mathematicians carrying out that activity are analyzed. This leads to the picture of a gulf between the two scientific communities which are based in different cultures of thinking and research. A (meta-)study of mathematics and all its facets termed here mathematicology is proposed. It could serve as common ground for cooperative studies by mathematicians and mathematics educators. Thereby the gulf will not necessarily become narrower but abridge over the differences and mutual misunderstandings could be built. 相似文献
130.