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   59487篇
  免费   1687篇
  国内免费   15篇
  2020年   415篇
  2019年   477篇
  2018年   3978篇
  2017年   3298篇
  2016年   2868篇
  2015年   732篇
  2014年   677篇
  2013年   2815篇
  2012年   1706篇
  2011年   3421篇
  2010年   3130篇
  2009年   2094篇
  2008年   2615篇
  2007年   3091篇
  2006年   878篇
  2005年   1030篇
  2004年   927篇
  2003年   810篇
  2002年   767篇
  2001年   1309篇
  2000年   1282篇
  1999年   910篇
  1998年   426篇
  1997年   367篇
  1992年   868篇
  1991年   802篇
  1990年   827篇
  1989年   717篇
  1988年   718篇
  1987年   688篇
  1986年   717篇
  1985年   790篇
  1984年   594篇
  1983年   547篇
  1982年   367篇
  1981年   363篇
  1979年   686篇
  1978年   429篇
  1977年   418篇
  1976年   415篇
  1975年   584篇
  1974年   670篇
  1973年   714篇
  1972年   618篇
  1971年   579篇
  1970年   573篇
  1969年   562篇
  1968年   750篇
  1967年   663篇
  1966年   592篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
22.
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   
23.
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   
24.
25.
26.
27.
28.
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   
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