全文获取类型
收费全文 | 82146篇 |
免费 | 3252篇 |
国内免费 | 46篇 |
专业分类
85444篇 |
出版年
2020年 | 923篇 |
2019年 | 1167篇 |
2018年 | 1633篇 |
2017年 | 1691篇 |
2016年 | 1729篇 |
2015年 | 1196篇 |
2014年 | 1473篇 |
2013年 | 6957篇 |
2012年 | 2607篇 |
2011年 | 2747篇 |
2010年 | 1711篇 |
2009年 | 1671篇 |
2008年 | 2520篇 |
2007年 | 2518篇 |
2006年 | 2214篇 |
2005年 | 2016篇 |
2004年 | 1938篇 |
2003年 | 1773篇 |
2002年 | 1828篇 |
2001年 | 2571篇 |
2000年 | 2449篇 |
1999年 | 1891篇 |
1998年 | 960篇 |
1997年 | 865篇 |
1996年 | 796篇 |
1995年 | 790篇 |
1994年 | 778篇 |
1993年 | 787篇 |
1992年 | 1576篇 |
1991年 | 1442篇 |
1990年 | 1481篇 |
1989年 | 1305篇 |
1988年 | 1299篇 |
1987年 | 1253篇 |
1986年 | 1270篇 |
1985年 | 1292篇 |
1984年 | 1094篇 |
1983年 | 975篇 |
1982年 | 763篇 |
1979年 | 1133篇 |
1978年 | 835篇 |
1975年 | 973篇 |
1974年 | 1028篇 |
1973年 | 1050篇 |
1972年 | 878篇 |
1971年 | 805篇 |
1969年 | 785篇 |
1968年 | 949篇 |
1967年 | 907篇 |
1966年 | 786篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
841.
An assessment of the Hasher and Zacks (1979) conceptualization of the automatic nature of the acquisition of spatial location information was made in the context of manipulations of subjects' intention to learn and mood state. The Velten (1968) mood induction procedure was used to establish depressed and nondepressed subjects. Half of each group was then presented with a matrix of geometric forms under instructions to learn the location of the forms (intentional) or to evaluate the pleasantness of the array (incidental). Subsequent tests of spatial location performance found no differences as a function of subjects' mood state, but did find a strong effect for instructional condition. The superior performance of the intentional subjects raises questions about the automatic nature of the encoding of spatial location. 相似文献
842.
McCormick RA 《America》1985,153(17):396-403
843.
844.
845.
846.
This study concerns the manner in which the traumatic events suffered by the parent in the Nazi holocaust are communicated to the second generation born after the Second World War. Additionally we investigated the effects of differences in wartime experiences on subsequent communication behaviors. Communication behaviors in families whose parents had been prisoners in concentration camps were compared with those of families who had displayed active resistance (i.e., were partisans) during the Second World War. The data indicate greater legitimacy and openness in discussing holocaust-related issues in the homes of ex-partisans than in the homes of ex-prisoners in concentration camps. Also, sons and daughters of the former group have better knowledge of the holocaust and hold more favorable attitudes than do sons and daughters in the second group. The implications of these findings are discussed. 相似文献
847.
848.
The purpose of this study was to examine the clothing practices in the daily selection, care, and purchase of clothing by adolescents in order to determine the extent these practices are performed independently or influenced by others, and to identify the factors involved in the activities. Clothing Practice Profiles were developed for both sexes in the three age groups corresponding to divisions in the Oregon 4-H program. The age group comparison revealed increasing frequency of independent activity in all three clothing practice areas (selection, care, and purchase) as age increased. Parental influence appeared to decrease with increasing age. Siblings' influence was minimal. Peer influence on selection and purchase practices increased. Media influence on daily clothing selection practices and clothing purchase practices in terms of wearing or buying identical or similar clothing was minimal. Media influence in advertisements increased with age, but purchases of advertised clothing items remained about the same. Age group comparisons were also made for selection factors and other care and purchase practices, including responsibilities for care of the member's and family's clothing, planning clothing purchases, sources of funds and methods of paying for clothing, use of clothing label information, and purchase factors. 相似文献
849.
Suicidal thoughts and their relationship to family stress and personal problems among high school seniors and college undergraduates 总被引:2,自引:0,他引:2
L S Wright 《Adolescence》1985,20(79):575-580
This study investigated the incidence of serious suicidal thoughts (ST's) among 207 high school seniors and 901 college students, and the relationship between ST's and family stress, drinking and drug-abuse problems, and delinquency in these groups. Over 10% of the high school and over 6% of the college students reported ST's. Those considering suicide attempts in both groups were more likely than their classmates to view their parents as having many conflicts with each other, to think of their relationship with their father as poor, to see at least one of their parents as either angry or depressed much of the time, and to perceive themselves as having a drinking or drug-abuse problem. These findings support the call for comprehensive counseling programs at both the high school and college levels. 相似文献
850.
This study, the first of three designed to investigate different age groups' knowledge of developmental norms of children, focused on older adolescent female university students. Data were collected from 280 midwestern university students through a questionnaire consisting of 16 items focusing on physical and social development of children from birth to three years of age. Results showed that knowledge of normal development was both over- and underestimated regardless of age of student or year in school. These findings are discussed within the context of the importance of knowledge of developmental norms for future parents. 相似文献