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   42733篇
  免费   1753篇
  国内免费   14篇
  2020年   429篇
  2019年   496篇
  2018年   682篇
  2017年   694篇
  2016年   761篇
  2015年   577篇
  2014年   663篇
  2013年   3059篇
  2012年   1266篇
  2011年   1248篇
  2010年   765篇
  2009年   751篇
  2008年   1135篇
  2007年   1120篇
  2006年   1008篇
  2005年   917篇
  2004年   862篇
  2003年   782篇
  2002年   828篇
  2001年   1337篇
  2000年   1296篇
  1999年   957篇
  1998年   448篇
  1997年   399篇
  1996年   383篇
  1992年   917篇
  1991年   835篇
  1990年   866篇
  1989年   753篇
  1988年   748篇
  1987年   711篇
  1986年   739篇
  1985年   823篇
  1984年   612篇
  1983年   575篇
  1982年   392篇
  1979年   715篇
  1978年   443篇
  1977年   440篇
  1976年   446篇
  1975年   613篇
  1974年   691篇
  1973年   740篇
  1972年   633篇
  1971年   598篇
  1970年   585篇
  1969年   571篇
  1968年   777篇
  1967年   681篇
  1966年   609篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Evaluated the effect of varied physician affect on subject recall, anxiety, and perceptions in a simulated tense and ambiguous medical situation. Forty women at risk for breast cancer viewed videotapes of an oncologist presenting--with either worried or nonworried affect--mammogram results. Although the mammogram results and the oncologist were the same in both presentation, analyses indicated that, compared to the women receiving the results from a nonworried physician, the women receiving the results from a worried physician recalled significantly less information, perceived the clinical situation as significantly more severe, reported significantly higher levels of state anxiety, and had significantly higher pulse rates. These results suggest that physician affect plays a critical role in patient reaction to medical information. Implications for compliance research, patient satisfaction, and physician training are discussed.  相似文献   
22.
The ability of two species of tits to remember the location and/or features of an object was tested in a delayed-matching-to-sample procedure. Three values of retention interval between presentation of the sample stimulus and the choice--30 sec, 5 min, and 15 min--were used. Both species performed at above-chance level at all retention intervals, and there was no significant decline in accuracy with increasing interval. A pool of 100 stimulus objects was used, but the results of control trials indicated that the birds responded primarily to location rather than stimulus features of the object itseif. Although the food-storing marsh tit tended to perform at a higher level than the non-storing great tit, the only significant difference between the species was in the first 50 trials of the first treatment, when the birds were acquiring the task. The results are discussed in relation to the hypothesized special memory capacity of food-storing birds.  相似文献   
23.
24.
25.
26.
Subjects in five experiments read nine-digit memory lists from a cathode ray tube for immediate recall. Reading aloud always produced a localized and reliable advantage for the last item, compared to reading silently. Two experiments on whispered and mouthed lists, with or without simultaneous broadband noise, falsified expectations derived from the theory of precategorical acoustic storage. Three additional experiments showed no enhancement of recency in the silent conditions when the digits were drawn or spelled gradually on the screen, a result that is inconsistent with the changing-state hypothesis. The classic auditory-visual modality effect is large and reliable, but still poorly understood.  相似文献   
27.
28.
29.
30.
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