全文获取类型
收费全文 | 45329篇 |
免费 | 1862篇 |
国内免费 | 29篇 |
专业分类
47220篇 |
出版年
2020年 | 442篇 |
2019年 | 608篇 |
2018年 | 822篇 |
2017年 | 765篇 |
2016年 | 882篇 |
2015年 | 582篇 |
2014年 | 767篇 |
2013年 | 3527篇 |
2012年 | 1375篇 |
2011年 | 1420篇 |
2010年 | 845篇 |
2009年 | 934篇 |
2008年 | 1207篇 |
2007年 | 1236篇 |
2006年 | 1136篇 |
2005年 | 974篇 |
2004年 | 991篇 |
2003年 | 905篇 |
2002年 | 918篇 |
2001年 | 1421篇 |
2000年 | 1484篇 |
1999年 | 1061篇 |
1998年 | 510篇 |
1997年 | 437篇 |
1995年 | 446篇 |
1992年 | 863篇 |
1991年 | 824篇 |
1990年 | 814篇 |
1989年 | 775篇 |
1988年 | 764篇 |
1987年 | 688篇 |
1986年 | 698篇 |
1985年 | 752篇 |
1984年 | 598篇 |
1983年 | 573篇 |
1982年 | 455篇 |
1979年 | 686篇 |
1978年 | 517篇 |
1977年 | 440篇 |
1976年 | 453篇 |
1975年 | 549篇 |
1974年 | 650篇 |
1973年 | 698篇 |
1972年 | 594篇 |
1971年 | 530篇 |
1970年 | 467篇 |
1969年 | 509篇 |
1968年 | 646篇 |
1967年 | 589篇 |
1966年 | 545篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
Control of responding by the elements of a compound discriminative stimulus and by the elements as individual discriminative stimuli 下载免费PDF全文
Birkimer JC 《Journal of the experimental analysis of behavior》1969,12(3):431-436
In the first of two studies, the responding of four albino rats was differentially reinforced in the presence of noise and light together and then tested in the presence of the noise and the light separately during extinction. The light exercised substantially more control of responding than did the noise. In the second study the responding of a similar group of four rats was differentially reinforced in the presence of the noise and the light separately. Control of responding by the light developed more rapidly than control by the noise. Results suggest that levels of control by stimuli after differential reinforcement with respect to the stimuli together can be predicted by the rates of development of control during differential reinforcement with respect to the stimuli separately. 相似文献
952.
953.
954.
955.
956.
957.
958.
959.
This study asked the question: What are the role expectancies of treatment personnel in the treatment community and are they consistent across patients' emotional condition? An 83-item inventory was developed and administered under three different sets of instructions, each characterizing a different patient condition. Treatment staff and administrators were asked to rate items on the basis of the level of expectancy they held for their team vocational rehabilitation counselor. The analyses suggest that treatment staff and counselors do not agree on role expectations and that patient condition is a significant mediating variable. 相似文献
960.