全文获取类型
收费全文 | 21653篇 |
免费 | 443篇 |
专业分类
管理学 | 3062篇 |
民族学 | 141篇 |
人才学 | 7篇 |
人口学 | 2598篇 |
丛书文集 | 81篇 |
教育普及 | 1篇 |
理论方法论 | 1755篇 |
综合类 | 291篇 |
社会学 | 10025篇 |
统计学 | 4135篇 |
出版年
2021年 | 111篇 |
2020年 | 267篇 |
2019年 | 373篇 |
2018年 | 961篇 |
2017年 | 1102篇 |
2016年 | 843篇 |
2015年 | 333篇 |
2014年 | 424篇 |
2013年 | 3107篇 |
2012年 | 692篇 |
2011年 | 970篇 |
2010年 | 763篇 |
2009年 | 723篇 |
2008年 | 703篇 |
2007年 | 824篇 |
2006年 | 477篇 |
2005年 | 504篇 |
2004年 | 488篇 |
2003年 | 442篇 |
2002年 | 436篇 |
2001年 | 445篇 |
2000年 | 398篇 |
1999年 | 370篇 |
1998年 | 283篇 |
1997年 | 285篇 |
1996年 | 293篇 |
1995年 | 244篇 |
1994年 | 243篇 |
1993年 | 227篇 |
1992年 | 286篇 |
1991年 | 248篇 |
1990年 | 245篇 |
1989年 | 248篇 |
1988年 | 234篇 |
1987年 | 208篇 |
1986年 | 218篇 |
1985年 | 240篇 |
1984年 | 229篇 |
1983年 | 227篇 |
1982年 | 188篇 |
1981年 | 188篇 |
1980年 | 176篇 |
1979年 | 208篇 |
1978年 | 185篇 |
1977年 | 159篇 |
1976年 | 158篇 |
1975年 | 159篇 |
1974年 | 117篇 |
1973年 | 106篇 |
1971年 | 101篇 |
排序方式: 共有10000条查询结果,搜索用时 318 毫秒
61.
62.
63.
In our zeal to deal with alcohol and drug abuse, we may have a distorted picture of what the majority of college students actually think about alcohol and drug use. Students in this study done at a public university located in the Deep South report being generally intolerant of substance abuse. 相似文献
64.
65.
Robert N. Bellah 《Theory and Society》1992,21(3):409-414
66.
A. F. Bissell 《Journal of applied statistics》1992,19(2):193-210
The fitting of a straight line that must pass through (0, 0) is a frequently encountered application of linear regression. Many computer packages provide a least-squares option sometimes identified as NO INT, or even NOINT, or as ‘suppressing the intercept’. Often these procedures are invalid or do not correspond to the most suitable model. This paper questions the least-squares-line approach and suggests some alternatives. Two measures are proposed for comparing the fit of alternative models. 相似文献
67.
68.
Anthony G. Pakes Ravindra Khattree 《Australian & New Zealand Journal of Statistics》1992,34(2):307-322
A positive random variable X with a finite mean has an induced length-biased law represented by Y, and Y is stochastically larger than X. An independent uniform random contraction of Y, UY, has the same law as X if and only if the latter is exponential. This property is extended to non-uniform contractions and a more general notion of length-biasing. The distributional equality of X and W leads to a functional equation for the moment function of X, which has either Infinitely many solutions or none. When U is constant, X can have a log-normal law, but it can also have laws with the same moment sequence as this log-nod law. The case where U has a certain beta, or generalized beta, law give t3 characterizations of generalized gamma laws, or to products of independent copies of them. This occurs even when these laws are not determined by their moment sequences. 相似文献
69.
We present and justify a propagation algorithm to facilitate the simultaneous calculation, for every node in a probabilistic exper system of the distribution of the associated random quantity, conditional on all the evidence obtained about the remaining nodes. 相似文献
70.
Suzanne T. Ortega David R. Johnson Peter G. Beeson Betty J. Craft 《Rural sociology》1994,59(4):598-619
Abstract This paper examines rural/urban differences and trends in mental health during the farm crisis of the 1980s in a large panel sample from a midwestern state. A community research perspective, which attributes differences to life styles, culture, and community context, is contrasted with an economic stress perspective, which focuses on individual differences in economic circumstances as determinants of rural-urban differences in mental health. Survey samples from 1981, 1986, and 1989 are used to examine differences among seven categories of community type. Multiple regression analysis of the trend and panel data provide support for both the individual economic distress and community context models. 相似文献