全文获取类型
收费全文 | 16443篇 |
免费 | 137篇 |
专业分类
管理学 | 2308篇 |
民族学 | 119篇 |
人才学 | 1篇 |
人口学 | 2982篇 |
丛书文集 | 26篇 |
教育普及 | 1篇 |
理论方法论 | 1088篇 |
综合类 | 362篇 |
社会学 | 7255篇 |
统计学 | 2438篇 |
出版年
2023年 | 35篇 |
2022年 | 33篇 |
2021年 | 54篇 |
2020年 | 108篇 |
2019年 | 144篇 |
2018年 | 1796篇 |
2017年 | 1875篇 |
2016年 | 1242篇 |
2015年 | 141篇 |
2014年 | 202篇 |
2013年 | 963篇 |
2012年 | 519篇 |
2011年 | 1331篇 |
2010年 | 1197篇 |
2009年 | 932篇 |
2008年 | 995篇 |
2007年 | 1165篇 |
2006年 | 187篇 |
2005年 | 372篇 |
2004年 | 393篇 |
2003年 | 320篇 |
2002年 | 201篇 |
2001年 | 154篇 |
2000年 | 145篇 |
1999年 | 151篇 |
1998年 | 113篇 |
1997年 | 100篇 |
1996年 | 136篇 |
1995年 | 80篇 |
1994年 | 68篇 |
1993年 | 94篇 |
1992年 | 97篇 |
1991年 | 102篇 |
1990年 | 81篇 |
1989年 | 83篇 |
1988年 | 74篇 |
1987年 | 73篇 |
1986年 | 66篇 |
1985年 | 81篇 |
1984年 | 69篇 |
1983年 | 77篇 |
1982年 | 49篇 |
1981年 | 46篇 |
1980年 | 41篇 |
1979年 | 52篇 |
1978年 | 43篇 |
1977年 | 35篇 |
1976年 | 35篇 |
1975年 | 33篇 |
1974年 | 40篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
Reed W. Larson B. Bradford Brown Jeylan T. Mortimer 《Journal of research on adolescence》2002,12(1):iii-viii
63.
Janet F. Werker Christopher T. Fennell Kathleen M. Corcoran Christine L. Stager 《Infancy》2002,3(1):1-30
What do novice word learners know about the sound of words? Word‐learning tasks suggest that young infants (14 months old) confuse similar‐sounding words, whereas mispronunciation detection tasks suggest that slightly older infants (18–24 months old) correctly distinguish similar words. Here we explore whether the difficulty at 14 months stems from infants' novice status as word learners or whether it is inherent in the task demands of learning new words. Results from 3 experiments support a developmental explanation. In Experiment 1, infants of 20 months learned to pair 2 phonetically similar words to 2 different objects under precisely the same conditions that infants of 14 months (Experiment 2) failed. In Experiment 3, infants of 17 months showed intermediate, but still successful, performance in the task. Vocabulary size predicted word‐learning performance, but only in the younger, less experienced word learners. The implications of these results for theories of word learning and lexical representation are discussed. 相似文献
64.
There was a time in this fair land when the railroad did not run When the wild majestic mountains stood alone against the
sun Long before the white man and long before the wheel When the green dark forest was too silent to be real
For they looked into the future and what did they see They saw an iron road running from the sea to the sea Bringing the goods
to a young growing land All up through the seaports and into their hands
From “Canadian Railroad Trilogy” by Gordon Lightfoot
The authors thank CPR managers and union officials representing CPR employees for their cooperation and patience in explaining
the intricacies of the railroad industry. Special appreciation is extended to Jason Copping, Labour Relations Manager, for
his facilitating our initial access to the company. 相似文献
65.
Stephen T. Russell 《Journal of research on adolescence》2002,12(3):305-324
Adolescence is often assumed to be the most important period of life for understanding teen childbearing risk. Developmental perspectives challenge that assumption, offering the possibility that early childhood characteristics may have unique and lasting effects on the risk for teen childbearing. This study examined family life risk factors (socioeconomic status, family stress, and parental involvement in education) and how their effects on teen childbearing risk varied, depending on the childhood age at which they were experienced. Prospective life history data from the National Child Development Study of Great Britain were used to study a birth cohort of 4,928 British women, 15.3% of who became pregnant as teens. This study demonstrated that data from early childhood significantly contribute to the understanding of teen childbearing risk. 相似文献
66.
We analyze the wealth ejfects of the Texaco racial discrimination lawsuit both on the shareholders of Texaco and its major
U.S. competitors. Employing a comprehensive data set which included every case docket entry and every Wall Street Journal
article on the case as an experimental stimulus, our findings suggest that the overall cost of the case to Texaco shareholders
exceeded $500 million, that Texaco's tribulations had little, if any, impact on the share prices of its major competitors,
and that Wall Street Journal coverage of the case was highly correlated with significant changes in Texaco stock prices. This
last finding provides significant support for Hite 's suppostion that newspaper editors “key ” on ex post stock price changes
in selecting the events to be covered in the next day's edition.
The authors are grateful to Kee Chung for helpful comments on earlier drafts and also acknowlege the help-ful assistance of
the staff of the law library at the Cecil C. Humphreys School of Law at The University of Memphis. 相似文献
67.
68.
69.
70.
Russia’s role in ‘animation’ of the Kyoto Protocol was crucial. Its initial vacillation on ratification was predominantly
due to political bargaining with the EU. Domestic economic rationales [i.e. impacts of emission trading and Joint Implementation
(JI) projects] were important to a much lesser extent and environmental motives did not seem to play any role in the decision.
Since the Protocol entered into force, there have been significant delays in complete establishment of policy implementation
frameworks, which are necessary for Russia to start benefiting from JI and emission trading. Only recently, in 2007, have
GHG inventories and a national registry been established and the responsibilities for implementation of the Protocol and JI
among the government departments have been distributed only to a certain extent. Some constraints hindering JI projects, such
as vague legislation, an unfavourable economic climate, lack of commitment to JI projects, corruption, xenophobia, state and
agency ‘capture’ still remain.
相似文献