全文获取类型
收费全文 | 64813篇 |
免费 | 2738篇 |
国内免费 | 37篇 |
出版年
2020年 | 658篇 |
2019年 | 790篇 |
2018年 | 1100篇 |
2017年 | 1084篇 |
2016年 | 1224篇 |
2015年 | 869篇 |
2014年 | 1022篇 |
2013年 | 4741篇 |
2012年 | 1961篇 |
2011年 | 1933篇 |
2010年 | 1190篇 |
2009年 | 1214篇 |
2008年 | 1675篇 |
2007年 | 1668篇 |
2006年 | 1475篇 |
2005年 | 1362篇 |
2004年 | 1300篇 |
2003年 | 1178篇 |
2002年 | 1213篇 |
2001年 | 2111篇 |
2000年 | 2044篇 |
1999年 | 1500篇 |
1998年 | 688篇 |
1997年 | 612篇 |
1996年 | 585篇 |
1992年 | 1345篇 |
1991年 | 1251篇 |
1990年 | 1254篇 |
1989年 | 1143篇 |
1988年 | 1135篇 |
1987年 | 1065篇 |
1986年 | 1089篇 |
1985年 | 1200篇 |
1984年 | 949篇 |
1983年 | 850篇 |
1982年 | 641篇 |
1979年 | 1065篇 |
1978年 | 718篇 |
1977年 | 680篇 |
1976年 | 685篇 |
1975年 | 870篇 |
1974年 | 1014篇 |
1973年 | 1086篇 |
1972年 | 921篇 |
1971年 | 846篇 |
1970年 | 818篇 |
1969年 | 829篇 |
1968年 | 1074篇 |
1967年 | 927篇 |
1966年 | 858篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
Fourth-, fifth-, and sixth-grade students responded to a questionnaire concerning their experiences with electronic videogames and computers. Teacher ratings of academic achievement, personality characteristics, and behavior patterns were also obtained for each student. These data were used to examine a number of hypotheses concerning potential harmful or beneficial effects of electronic videogames on school-age children, and to provide preliminary evidence concerning the correlates of computer usage by school-age children. Videogame usage showed significant positive correlations with teacher ratings of impulsivity, significant negative correlations with ratings of academic achievement, and little relationship to rated sociability. Videogame use also proved positively related to other social activities and to microcomputer use. 相似文献
952.
Correspondences between verbal responding (saying) and nonverbal responding (doing) may be organized in terms of the classes of verbal/nonverbal relations into which particular instances of verbal/nonverbal response sequences can enter. Contingency spaces, which display relations among events in terms of the probability of one event given or not given another, have been useful in analyses of nonverbal behavior. We derive a taxonomy of verbal/nonverbal behavior relations from a contingency space that takes into account two conditional probabilities: the probability of a nonverbal response given a verbal response and that probability given the absence of the verbal response. For example, positive correspondence may be said to exist as a response class when the probability of doing is high given saying but is otherwise low. Criteria for other generalized classes, including negative correspondence, follow from this analysis. 相似文献
953.
954.
955.
956.
957.
958.
Hand movements: a window into haptic object recognition 总被引:15,自引:0,他引:15
959.
960.
Work values and key influencers of a sample of black male and female adolescents were examined. Results indicated that boys and girls valued both the intrinsic and extrinsic rewards of work; however, girls reported slighter stronger extrinsic values than did boys. In addition, the sexes reported differences in the importance of specific work values such as "making lots of money," and "doing important things." When naming a key influencer, respondents tended to cite a same-sex and race individual. Sex of one's key influencer was related to certain work values, with subjects reporting a male key influencer valuing "trying out one's own ideas" and "having a secure future" more than those reporting a female key influencer. The interaction of sex of subject and sex of key influencer was significant on one of the work value outcomes. Implications of these findings are considered. 相似文献