全文获取类型
收费全文 | 38212篇 |
免费 | 1487篇 |
国内免费 | 18篇 |
出版年
2020年 | 436篇 |
2019年 | 556篇 |
2018年 | 749篇 |
2017年 | 810篇 |
2016年 | 815篇 |
2015年 | 576篇 |
2014年 | 691篇 |
2013年 | 2983篇 |
2012年 | 1282篇 |
2011年 | 1279篇 |
2010年 | 823篇 |
2009年 | 792篇 |
2008年 | 1138篇 |
2007年 | 1166篇 |
2006年 | 1035篇 |
2005年 | 923篇 |
2004年 | 867篇 |
2003年 | 817篇 |
2002年 | 842篇 |
2001年 | 1171篇 |
2000年 | 1128篇 |
1999年 | 881篇 |
1998年 | 384篇 |
1997年 | 385篇 |
1996年 | 359篇 |
1995年 | 372篇 |
1994年 | 359篇 |
1993年 | 354篇 |
1992年 | 752篇 |
1991年 | 649篇 |
1990年 | 716篇 |
1989年 | 612篇 |
1988年 | 649篇 |
1987年 | 606篇 |
1986年 | 614篇 |
1985年 | 555篇 |
1984年 | 514篇 |
1983年 | 495篇 |
1980年 | 352篇 |
1979年 | 577篇 |
1978年 | 410篇 |
1975年 | 461篇 |
1974年 | 503篇 |
1973年 | 532篇 |
1972年 | 394篇 |
1971年 | 390篇 |
1969年 | 403篇 |
1968年 | 472篇 |
1967年 | 428篇 |
1966年 | 353篇 |
排序方式: 共有10000条查询结果,搜索用时 140 毫秒
921.
922.
923.
924.
Nonparametric post hoc comparisons for trend 总被引:1,自引:0,他引:1
925.
Conceptions of broad and narrow attention 总被引:2,自引:0,他引:2
P L Wachtel 《Psychological bulletin》1967,68(6):417-429
926.
927.
928.
929.
An experiment is reported in which 10 Ss possessing normal hearing were required to make discriminations of continuity or interruption in a longer less intense signal (Tone A) which alternated in time with a shorter more intense signal (Tone B). The signals were presented dichotically with Tone A at the right ear. Three Tone B frequencies of 300, 1000, and 4000 cps and five Tone A frequencies somewhat near each of the Tone B frequencies were employed. The results demonstrated that as Tone A was nearer to Tone B in frequency, continuity thresholds in Tone A occurred at longer durations of Tone B. The results are discussed in terms of a central neural model. 相似文献
930.
The Pulfrich pendulum was evaluated as a potential screening device for the detection of anomalies of binocular vision. For this purpose, a booth was set up at the Kentucky State Fair (1964) and the general public invited to observe the pendulum and record their responses with the equipment provided. The obtained results indicate that a dichotomy can be achieved between those who have binocular vision and those who do not. However, gradations of binocular vision from poor to good cannot be achieved with the pendulum as presently understood. Contrary to explanatory theory the characteristic shape of the seen pendulum path was asymmetrical following the rule that the path was displaced away from the observer on the side of the filtered eye. 相似文献