全文获取类型
收费全文 | 67228篇 |
免费 | 2737篇 |
国内免费 | 20篇 |
专业分类
69985篇 |
出版年
2020年 | 641篇 |
2019年 | 810篇 |
2018年 | 1094篇 |
2017年 | 1129篇 |
2016年 | 1191篇 |
2015年 | 889篇 |
2014年 | 1046篇 |
2013年 | 4835篇 |
2012年 | 1979篇 |
2011年 | 2016篇 |
2010年 | 1227篇 |
2009年 | 1199篇 |
2008年 | 1767篇 |
2007年 | 1742篇 |
2006年 | 1581篇 |
2005年 | 1468篇 |
2004年 | 1394篇 |
2003年 | 1275篇 |
2002年 | 1310篇 |
2001年 | 2067篇 |
2000年 | 1929篇 |
1999年 | 1468篇 |
1998年 | 727篇 |
1996年 | 606篇 |
1992年 | 1309篇 |
1991年 | 1230篇 |
1990年 | 1212篇 |
1989年 | 1140篇 |
1988年 | 1144篇 |
1987年 | 1096篇 |
1986年 | 1131篇 |
1985年 | 1230篇 |
1984年 | 954篇 |
1983年 | 900篇 |
1982年 | 686篇 |
1981年 | 654篇 |
1979年 | 1112篇 |
1978年 | 752篇 |
1977年 | 681篇 |
1976年 | 716篇 |
1975年 | 934篇 |
1974年 | 1066篇 |
1973年 | 1129篇 |
1972年 | 953篇 |
1971年 | 876篇 |
1970年 | 879篇 |
1969年 | 894篇 |
1968年 | 1142篇 |
1967年 | 1014篇 |
1966年 | 934篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
271.
272.
Practice in front of a mirror is a common procedure for activities such as dance, gymnastics, and other sports. The purpose of this study was to examine the effect that performing with concurrent visual feedback from a mirror had on the acquisition of the power clean movement. 18 college-age males who had no prior experience with the power clean movement served as subjects who were assigned to one of two groups. One group had use of a mirror during the practice trials and the other practiced without the mirror. All subjects viewed an instructional videotape and had practice trials. All subjects were evaluated for proper technique on a pretest, a posttest without the mirror, and a posttest with the mirror. Analysis showed a significant difference between pre- and posttest performances for both groups and a significant difference between groups on the posttest performances with the mirror. Evidently the videotaped instruction was sufficient to allow both groups to improve in performance of the power clean. Differences in posttest performances with the mirror reflected the type of feedback (with or without the mirror) available during training. 相似文献
273.
274.
275.
276.
LISE M. SAARI TERRY R. JOHNSON STEVEN D. MCLAUGHLIN DENISE M. ZIMMERLE 《Personnel Psychology》1988,41(4):731-743
A survey was systematically developed to assess issues related to management training and education, and it was sent to 1,000 randomly selected U.S. companies with at least 1,000 employees. Based on a 61% response rate, findings were obtained regarding issues such as needs assessment, management training and development approaches, reasons for selecting particular programs, characteristics of participants, how decisions are made regarding who will participate, preparation and follow-up of participants, evaluation of management training programs, future management training trends, and needed training content. Significant findings by company size and industry type also are reported. 相似文献
277.
A E Puente 《Perceptual and motor skills》1988,66(2):639-642
MMPI profiles of 22 chronic arthritic patients were compared to 22 control pain (nonorganic) patients. While elevations were noted in the HS, D, and Hy scales for the rheumatoid patients, the over-all profiles differed from controls on the PA scale. 相似文献
278.
Under simple- and choice-RT conditions, the biceps brachii muscle was examined in 8 healthy male subjects to determine how the temporal and spatial characteristics of elbow flexion and forearm supination differed at the initial phase of EMG activity and whether preparation or the presence of response uncertainty influenced the EMG outputs of the two movements. In the simple-RT condition, RT of supination was significantly faster than that of flexion but EMG activity of supination was less than that of flexion. In contrast, in the choice-RT condition, RT of flexion was significantly faster than that of supination but EMG activity of flexion was significantly reduced compared to supination. These findings indicate that advanced preparation or motor set facilitates the differentiation of RTs and EMG activities of the response movements and that response uncertainty causes a significant change in the temporal and spatial specificity of both elbow flexion and forearm supination. 相似文献
279.
For 3 consecutive days cockroaches (Periplaneta americana) were exposed to either escapable, inescapable, or no shock in an escape task. Twenty-four hours later they were tested in a shuttlebox escape task. There were reliable differences between escapable and inescapable animals and between inescapable and control animals in both escape latencies and the number of failures to escape. 相似文献
280.
Previously we (Bruno & Cutting, 1988) explored the perception of spatial relations among objects laid out in a computer-generated environment. In his commentary on our article, Massaro (1988) raised several issues. The most important is from his reanalysis, which indicated that--because of a subadditive trend in the results--additive and multiplicative strategies fit our data in Experiment 1 about equally well. In reply, we performed a different analysis. Results corroborate subadditivity--and hence multiplicative information combination--in Experiment 1 but provide no evidence for it in Experiments 2 and 3. On the whole, then, the results still support additivity more strongly than any other combination rule and thus support our notion of minimodularity. 相似文献