全文获取类型
收费全文 | 61292篇 |
免费 | 2531篇 |
国内免费 | 32篇 |
专业分类
63855篇 |
出版年
2020年 | 792篇 |
2019年 | 943篇 |
2018年 | 1392篇 |
2017年 | 1401篇 |
2016年 | 1432篇 |
2015年 | 946篇 |
2014年 | 1175篇 |
2013年 | 5535篇 |
2012年 | 2131篇 |
2011年 | 2308篇 |
2010年 | 1370篇 |
2009年 | 1267篇 |
2008年 | 2021篇 |
2007年 | 1945篇 |
2006年 | 1727篇 |
2005年 | 1487篇 |
2004年 | 1448篇 |
2003年 | 1315篇 |
2002年 | 1355篇 |
2001年 | 1917篇 |
2000年 | 1849篇 |
1999年 | 1400篇 |
1998年 | 732篇 |
1997年 | 620篇 |
1996年 | 568篇 |
1995年 | 549篇 |
1994年 | 536篇 |
1993年 | 572篇 |
1992年 | 1111篇 |
1991年 | 1064篇 |
1990年 | 1037篇 |
1989年 | 938篇 |
1988年 | 895篇 |
1987年 | 875篇 |
1986年 | 882篇 |
1985年 | 947篇 |
1984年 | 753篇 |
1983年 | 640篇 |
1982年 | 507篇 |
1979年 | 745篇 |
1978年 | 533篇 |
1975年 | 648篇 |
1974年 | 710篇 |
1973年 | 671篇 |
1972年 | 606篇 |
1971年 | 539篇 |
1969年 | 507篇 |
1968年 | 614篇 |
1967年 | 621篇 |
1966年 | 529篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
201.
202.
Twenty-nine salary discrimination court cases were examined to determine ways an organization can refute a regression analysis that leads to the inference of discrimination in compensation. It was found to be equally effective for the organization to introduce its own regression, other statistics, or no statistics. The plaintiff won all of the cases when discrimination was proven in promotion. The defendant won all cases when discrimination was not proven in promotion. Defendants also won all cases when plaintiffs inappropriately treated jobs as fungible or when they failed to include important variables. Market variables may be included in regressions if defendants can show they were applied consistently to determine salaries. The implications of the courts' acceptance of some regressions for comparable worth is presented, and a list of recommendations is made for organizations that may be faced with results from regression analysis in court. 相似文献
203.
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
204.
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
205.
This paper gives a method for determining a sample size that will achieve a prespecified bound on confidence interval width for the interrater agreement measure,. The same results can be used when a prespecified power is desired for testing hypotheses about the value of kappa. An example from the literature is used to illustrate the methods proposed here. 相似文献
206.
207.
Renato A. Lewin 《Studia Logica》1988,47(4):387-389
We prove that there are two involutions defined by monadic terms that characterize Monadic Algebras. We further prove that the variety of Monadic Algebras is the smallest variety of Interior Algebras where these involutions give rise to an interpretation from the variety of Bounded Distributive Lattices into it.Research funded by Fondecyt, project N 764-1987. 相似文献
208.
We obtain in this paper a representation of the formulae of extensions ofL
by generalized quantifiers through functors between categories of first-order structures and partial isomorphisms. The main tool in the proofs is the back-and-forth technique. As a corollary we obtain the Caicedo's version of Fraïssés theorem characterizing elementary equivalence for such languages. We also discuss informally some geometrical interpretations of our results. 相似文献
209.
210.
It has been proposed that a principal cause of the agrammatism of some Broca's aphasics is that such patients, unlike normal subjects, are unable to make use of a special retrieval mechanism for closed-class ("function") words (D. C. Bradley, 1978, Computational distinctions of vocabulary type, Unpublished Ph.D. thesis; D. C. Bradley, M. F. Garrett, & E. B. Zurif, 1980. In D. Caplan (Ed.), Biological studies of mental processes). The main evidence for the existence of such a mechanism consisted of two observations: (1) the recognition of open-class words was observed to be frequency-sensitive, but that of closed-class words was not; and (2) lexical decisions for nonwords which began with open-class words were delayed, whereas there was no such interference for nonwords which began with closed-class words. However, the first of these observations has proved nonreplicable (e.g., B. Gordon & A. Caramazza, 1982, Brain and Language, 15, 143-160, 1983, Brain and Language, 19, 335-345; J. Segui, J. Mehler, W. Frauenfelder, & J. Morton, 1982, Neuropsychologia, 20, 615-627), and in the present paper, three lexical decision experiments are reported in which it is found that, when certain confounding variables are controlled, nonwords which begin with closed-class words are subject to interference. Moreover, contrary to a suggestion of Kolk and Blomert (1985, Brain and Language, 26, 94-105) the interference is independent of the presence of closed-class items in the lexical decision word list. It seems, then, that closed-class words are not qualitatively different from open-class words with respect either to frequency sensitivity or to nonword interference, and in consequence, the above proposed explanation of agrammatism is left without major empirical support. 相似文献