全文获取类型
收费全文 | 8423篇 |
免费 | 432篇 |
国内免费 | 2篇 |
出版年
2021年 | 89篇 |
2020年 | 159篇 |
2019年 | 193篇 |
2018年 | 235篇 |
2017年 | 242篇 |
2016年 | 250篇 |
2015年 | 174篇 |
2014年 | 242篇 |
2013年 | 958篇 |
2012年 | 361篇 |
2011年 | 383篇 |
2010年 | 236篇 |
2009年 | 247篇 |
2008年 | 295篇 |
2007年 | 325篇 |
2006年 | 276篇 |
2005年 | 268篇 |
2004年 | 243篇 |
2003年 | 217篇 |
2002年 | 256篇 |
2001年 | 109篇 |
2000年 | 93篇 |
1999年 | 97篇 |
1998年 | 116篇 |
1997年 | 125篇 |
1996年 | 92篇 |
1995年 | 87篇 |
1994年 | 88篇 |
1993年 | 117篇 |
1992年 | 103篇 |
1991年 | 74篇 |
1990年 | 69篇 |
1989年 | 77篇 |
1988年 | 71篇 |
1987年 | 80篇 |
1986年 | 64篇 |
1985年 | 65篇 |
1984年 | 82篇 |
1983年 | 84篇 |
1982年 | 95篇 |
1981年 | 86篇 |
1980年 | 94篇 |
1979年 | 82篇 |
1978年 | 105篇 |
1977年 | 100篇 |
1976年 | 90篇 |
1975年 | 107篇 |
1974年 | 87篇 |
1973年 | 62篇 |
1971年 | 58篇 |
排序方式: 共有8857条查询结果,搜索用时 578 毫秒
231.
232.
233.
A simple input and output circuit is described that allows users to sense contact closures and to drive relays from a Digital Equipment Corporation LSI-11 DRV 11 parallel interface board or a signal-compatible equivalent. 相似文献
234.
Effects associated with specific feedback modalities are neither clear nor well explored. The present paper provides an overview of feedback modalities typically used for the presentation of information from major physiological systems. Some consideration of feedback modality in relation to theory is provided with a discussion of trends in past applications. 相似文献
235.
236.
237.
238.
The comprehension of sentences with “because” or “if” was investigated in children aged 2;9–11;11. Imitation, comprehension (choosing one of two picture sequences to go with a sentence), recognition (judging sentences with connective or structure differences as heard before or not), and synonymy (judging equivalence of meaning in sentences with different connectives or structures) tasks were administered, along with logical ordering, reversibility, and classification tasks. Above-chance responding in the comprehension task occurred by age 8, and in recognition and synonymy by age 10. Cognitive performance predicted 28.4% of the variance in the linguistic scores and cognitive success was concurrent with or preceded linguistic success. Comprehension of “because” and “if” appears to develop gradually, and is related to the development of certain operative rules. 相似文献
239.
Married couples seeking sex therapy, marital therapy, or no form of therapy were compared with respect to personality, sexual and marital functioning. The Sexual Dysfunction and Marital Difficulties groups (15 and 10 couples respectively) were obtained from the waiting lists of a sexual dysfunction service and marital therapy unit. Non-Problem subjects (15 couples) were from a volunteer sample. Personal adjustment, sexual and marital functioning were assessed by means of the Eysenck Personality Inventory, a Sexual Behavior Questionnaire, the Locke-Wallace Marital Adjustment Survey, and the Azrin Marital Happiness Scale. Results indicated that although all three groups were within the normal range, problem couples had higher ‘neuroticism’ scores than did Non-Problem couples. Marital Problem couples were the most debilitated. Their marital adjustment was lowest, and their sexual functioning was comparable to the Sexual Dysfunction group. Marital adjustment of the Sexual Dysfunction couples was significantly higher than that of the Marital Difficulties couples. Therapeutic and theoretical implications of the differentiating characteristics in the three couple categories are discussed. 相似文献
240.