全文获取类型
收费全文 | 36310篇 |
免费 | 1380篇 |
国内免费 | 17篇 |
出版年
2020年 | 362篇 |
2019年 | 366篇 |
2018年 | 559篇 |
2017年 | 581篇 |
2016年 | 602篇 |
2015年 | 425篇 |
2014年 | 554篇 |
2013年 | 2659篇 |
2012年 | 1033篇 |
2011年 | 1066篇 |
2010年 | 687篇 |
2009年 | 637篇 |
2008年 | 930篇 |
2007年 | 936篇 |
2006年 | 838篇 |
2005年 | 785篇 |
2004年 | 735篇 |
2003年 | 652篇 |
2002年 | 732篇 |
2001年 | 1321篇 |
2000年 | 1312篇 |
1999年 | 952篇 |
1998年 | 407篇 |
1997年 | 368篇 |
1996年 | 354篇 |
1992年 | 771篇 |
1991年 | 710篇 |
1990年 | 762篇 |
1989年 | 667篇 |
1988年 | 643篇 |
1987年 | 649篇 |
1986年 | 620篇 |
1985年 | 645篇 |
1984年 | 540篇 |
1983年 | 476篇 |
1982年 | 374篇 |
1979年 | 583篇 |
1978年 | 434篇 |
1977年 | 388篇 |
1976年 | 341篇 |
1975年 | 516篇 |
1974年 | 581篇 |
1973年 | 553篇 |
1972年 | 487篇 |
1971年 | 444篇 |
1970年 | 390篇 |
1969年 | 481篇 |
1968年 | 551篇 |
1967年 | 490篇 |
1966年 | 464篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
221.
222.
This study examined the career aspirations of pregnant teens enrolled in a program designed to minimize their chances of dropping out of high school. The teens completed a demographic data form that included questions on their career aspirations. The data were coded by Holland type using the Dictionary of Holland Occupational Codes. Trends were discussed in light of the future labor market and critical need for career counseling for this at-risk population. 相似文献
223.
A recent paper by Kail (1988) in this journal appears to contain a significant error in the data analysis. The "goodness-of-fit" coefficients reported which suggest that overall about 94% of the variance can be accounted for by the model seem to be a substantial overestimation as a result of inappropriate procedures for statistical modeling. Using the data made available to us by Kail, we have reanalyzed these results. The corrected values range from 0.9 to 92.1% for the individual tasks with an overall average between 40 and 60%. We suggest that the support for the original conclusions is considerably weaker than reported. 相似文献
224.
225.
226.
Several hypotheses derived from P. Brown and Levinson's (1987) politeness theory were tested with Ss from the United States and Korea. Ss imagined themselves in situations in which they were to make a request. They then indicated exactly what they would say in each situation and what their perceptions of the request size, the hearer's power, and the closeness of their relationship with the hearer were. Consistent with P. Brown and Levinson's theory, power, distance, and size contributed significantly to politeness. Significant predictor variable interactions suggested that an additive model is not appropriate. Finally, there was evidence of cultural and gender differences in the weighting of these predictor variables. These differences can partially account for cultural and gender differences in language use. 相似文献
227.
A brief, simple measure of different types of attributions for partner behavior was examined in 3 studies of married couples. Reliability was established by high internal consistency and test-retest correlations. Causal and responsibility attribution scores correlated with marital satisfaction, attributions for marital difficulties, and attributions for actual partner behaviors generated by spouses. Responsibility attributions were related to (a) reported anger in response to stimulus behaviors used in the measure and (b) the amount of anger displayed by wives during a problem-solving interaction with their partner. The extent to which husbands and wives whined during their discussion also correlated with their responsibility attributions. The results address several problems with existing assessments, and their implications for the measurement of attributions in marriage are discussed. 相似文献
228.
The influence of information feedback on the learning of a multiple-degree-of-freedom activity, the overhand throw, was investigated. During learning, feedback was presented in the form of knowledge of results, knowledge of performance, knowledge of performance with attention-focusing cues, or knowledge of performance with error-correcting transitional information. Across 12 practice sessions, performance was assessed with respect to both throwing distance and throwing form. Subjects provided with knowledge of performance along with transitional information demonstrated significant gains in throwing distance, compared with subjects receiving knowledge of performance or knowledge of results alone. Movement form ratings followed the same trend. Providing learners with cues to focus their attention on the relevant aspects of knowledge of performance or directly providing transitional information was a better aid to the acquisition of throwing form than providing knowledge of results or knowledge of performance alone. These results support the hypothesis that knowledge of results may not be the most potent form of feedback in multiple-degree-of-freedom activities and that knowledge of performance, when combined with additional information, can lead to significant gains in skill acquisition. 相似文献
229.
This study reanalyzes kinematically (via film) the pre- and postoperative locomotor behavior of 4 of the 10 monkeys with partial spinal cord lesions (T8) briefly described by Eidelberg, Walden, and Nguyen (1981). The behavior of the remaining 6 monkeys is qualitatively described. The analysis reveals that 5 of the animals initially exhibited unilateral hind limb stepping. Hind and forelimb cycle durations often differed postoperatively; the hind limbs commonly showed increased values, whereas forelimb cycle durations were reduced: ipsilateral interlimb phase values were usually inconsistent. A review of prior studies of primate spinal cord lesions indicates that sparing of the ventrolateral quadrant may not be essential for locomotor recovery (cf. Eidelberg, Walden, & Nguyen, 1981). Furthermore, this review as well as the kinematic analysis indicates that primates with very significant spinal lesions can stilI exhibit locomotor movements. Thus, although the primate's spinal cord seems less able than other mammals' to readily organize locomotor movements (Eidelberg, Walden, & Nguyen, 1981), the total absence of stepping in primates with completely transected cords is unexpected and warrants further research. 相似文献
230.
Individuals' failure to exercise actual control over an event might be compensated for by trying to bolster a generalized, subjective sense of control. Control might then be sought by undertaking acts the effect of which on the environment is illusory. This observation led to the hypothesis that stress, which undermines persons' sense of control, would engender illusory perceptions of controllability. The hypothesis was tested in 3 experiments that required Ss to choose between 2 gambling forms. Although the 2 forms were essentially identical, 1 was designed to instill an illusion of control. The results showed that highly stressed Ss, compared with those who experienced low stress, preferred gambling forms that heightened perceptions of controllability. 相似文献