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   59597篇
  免费   2487篇
  国内免费   21篇
  2020年   623篇
  2019年   715篇
  2018年   1052篇
  2017年   1084篇
  2016年   1145篇
  2015年   835篇
  2014年   963篇
  2013年   4496篇
  2012年   1827篇
  2011年   1795篇
  2010年   1125篇
  2009年   1019篇
  2008年   1568篇
  2007年   1567篇
  2006年   1334篇
  2005年   1233篇
  2004年   1153篇
  2003年   1097篇
  2002年   1114篇
  2001年   1871篇
  2000年   1798篇
  1999年   1337篇
  1998年   598篇
  1996年   540篇
  1992年   1217篇
  1991年   1157篇
  1990年   1181篇
  1989年   1030篇
  1988年   1042篇
  1987年   981篇
  1986年   1035篇
  1985年   1112篇
  1984年   847篇
  1983年   774篇
  1982年   544篇
  1981年   538篇
  1979年   970篇
  1978年   659篇
  1977年   606篇
  1976年   585篇
  1975年   823篇
  1974年   963篇
  1973年   1014篇
  1972年   850篇
  1971年   807篇
  1970年   797篇
  1969年   760篇
  1968年   1015篇
  1967年   885篇
  1966年   794篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
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   
32.
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   
33.
34.
35.
36.
37.
We report an eye movement experiment investigating the influence of the focus operator only on syntactic processing of "long" relative clause sentences. Paterson, Liversedge, and Underwood (1999) found that readers were garden pathed by "short" reduced relative clause sentences containing the focus operator only . They argued that due to thematic differences between "short" and "long" relative clause sentences, garden path effect might not occur when "long" reduced relative clause sentences are read. Eye-tracking data show that garden path effects found during initial processing of the disambiguating verb of "long" reduced sentences without only were absent or delayed in the case of counterparts with only . We discuss our results in terms of current theories of sentence processing.  相似文献   
38.
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   
39.
40.
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