首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   66369篇
  免费   1859篇
  国内免费   23篇
  68251篇
  2020年   462篇
  2019年   672篇
  2018年   4116篇
  2017年   3475篇
  2016年   2975篇
  2015年   829篇
  2014年   837篇
  2013年   3803篇
  2012年   1851篇
  2011年   3719篇
  2010年   3276篇
  2009年   2342篇
  2008年   2870篇
  2007年   3310篇
  2006年   1192篇
  2005年   1204篇
  2004年   1106篇
  2003年   1060篇
  2002年   963篇
  2001年   1602篇
  2000年   1638篇
  1999年   1151篇
  1998年   587篇
  1997年   470篇
  1996年   459篇
  1995年   448篇
  1992年   957篇
  1991年   935篇
  1990年   926篇
  1989年   858篇
  1988年   814篇
  1987年   792篇
  1986年   764篇
  1985年   838篇
  1984年   643篇
  1983年   563篇
  1979年   683篇
  1978年   543篇
  1977年   470篇
  1976年   442篇
  1975年   608篇
  1974年   644篇
  1973年   721篇
  1972年   590篇
  1971年   518篇
  1970年   453篇
  1969年   514篇
  1968年   607篇
  1967年   560篇
  1966年   580篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
181.
Body-frame size is an important factor in determining an optimal body weight for a given height. Previous studies have indicated that many individuals incorrectly estimate their body-frame size, and, as a result, incorrectly assess their ideal weight. The present study investigated the accuracy of estimation of body-frame size as a function of sex and actual frame size. The subjects were 66 men and 52 women participating in a community adult fitness program. Data indicated that medium-framed individuals were the most accurate in their estimations of body-frame size. Also, women were twice as likely to be accurate as were men. These results are interpreted to mean that most people assume they are medium-framed and that there is a sex difference in the way body-frame size is estimated.  相似文献   
182.
Cutoff scores are used in a variety of settings to help managers make personnel decisions. Although cutoff scores are used widely, information about their derivation and appropriate use is scattered in the legal, psychometric, and professional literatures. The purpose of this paper is to analyze critically and to integrate these diverse literatures, to summarize what is known and what is unknown about the use and misuse of cutoff scores. Alternative methods are examined in relation to legal precedents set by the courts, to psychometric principles, and to the various sets of professional guidelines. Directions for future research are suggested, and we conclude with a set of recommendations regarding acceptable professional practice in this area.  相似文献   
183.
32 children 5 to 6 yr. old, 32 9 to 11 yr. old, and 32 adults linked musical fragments to emotions in a similar manner, older subjects being more accurate. Some emotions were more difficult than others; anger and fear were often confused. Older subjects gave better justifications for their choices.  相似文献   
184.
Visual cognitive differences between hearing (N = 16) and deaf (N = 32) high-school and middle-school students were studied. Visual tasks were presented on a microcomputer and response latencies were collected. Significant differences were noted between the deaf and normal groups but not between total communication deaf and oral deaf students. These differences support the hypothesis that deaf students prefer a visual cognitive strategy. Implications for educating the deaf are discussed.  相似文献   
185.
The Rosenberg Self-esteem Scale was administered to 550 14- and 16-yr.-old (+/- 6 mo.) girls. Self-esteem scores were categorized by weight and weight by height. Scores on the Quetelet Index for obesity were correlated with self-esteem scores. Mean self-esteem of the low- and middle-weight by height group was significantly higher than the mean of the high-weight by height group. In analyzing weight alone, the self-esteem of the middle-weight group was significantly higher than the self-esteem of the high-weight group. The correlation of the obesity index and self-esteem indicated that as weight increased self-esteem decreased.  相似文献   
186.
Observations on three children with neurolisteriosis (one case of meningitis, two cases of meningoencephalitis, each Serovar 4 b), show that even after the neonatal period, listeriosis must not be ignored in the process of diagnosis and therapy. It is the bacteriological examination of the cerebrospinal fluid, together with the blood culture, and not clinical symptoms and serology that guarantee a timely diagnosis and therapy (ampicillin and gentamicin).  相似文献   
187.
188.
Insight reflects the unitary nature of psychic activity in contrast to the fragmentation created in abstracting categories for the purpose of study and discussion. The unique analytic clinical dyad offers a structure in which intrapsychic fragments can be actualized and integrated. As a result, the analyst's contribution is more crucially one of exploration than of revelation. Whatever the area of examination, past or present, the link to analytic immediacy offers the opportunity to make meanings meaningful, to convert known facts to psychic truths. The analyst's clinical task requires his private self-analysis as part of the collaborative exploration of how the patient's mind works. Higher level ego functioning, including acutely active remembering, is at times transiently loosened in order for the analyst to share in the clinical work of discovery. The words the analyst uses to communicate his understanding convey only approximate manifest meanings, though they structurally reveal deeper messages of importance to the patient. These verbal approximations help stimulate self-reflection in the analysand as a step in the process of gaining insight.  相似文献   
189.
190.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号