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   1277867篇
  免费   94375篇
  国内免费   1993篇
耳鼻咽喉   18198篇
儿科学   42391篇
妇产科学   37923篇
基础医学   187343篇
口腔科学   35423篇
临床医学   108347篇
内科学   252000篇
皮肤病学   26576篇
神经病学   99397篇
特种医学   50077篇
外国民族医学   366篇
外科学   198034篇
综合类   26550篇
现状与发展   1篇
一般理论   300篇
预防医学   92770篇
眼科学   29126篇
药学   97960篇
  1篇
中国医学   2506篇
肿瘤学   68946篇
  2018年   11867篇
  2015年   11666篇
  2014年   16062篇
  2013年   24441篇
  2012年   33671篇
  2011年   36077篇
  2010年   21282篇
  2009年   20106篇
  2008年   35106篇
  2007年   38061篇
  2006年   38655篇
  2005年   37956篇
  2004年   36517篇
  2003年   35485篇
  2002年   35021篇
  2001年   58183篇
  2000年   59651篇
  1999年   50768篇
  1998年   14261篇
  1997年   12835篇
  1996年   13105篇
  1995年   12375篇
  1994年   11783篇
  1993年   10879篇
  1992年   41045篇
  1991年   40413篇
  1990年   39924篇
  1989年   38754篇
  1988年   36146篇
  1987年   35412篇
  1986年   33758篇
  1985年   32184篇
  1984年   23950篇
  1983年   20832篇
  1982年   12385篇
  1981年   10934篇
  1980年   10213篇
  1979年   22661篇
  1978年   15890篇
  1977年   13738篇
  1976年   12983篇
  1975年   14210篇
  1974年   16692篇
  1973年   16088篇
  1972年   15330篇
  1971年   14238篇
  1970年   13219篇
  1969年   12740篇
  1968年   11982篇
  1967年   10486篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
Reports on individual nonbehavioral child and adolescent psychotherapy since 1963 are reviewed. Inclusion criteria required some minimal contrasting group. Forty-three studies were assessed for basic methodological adequacy and main findings. The authors conclude that summary impressions from this body of literature cannot be made due to the magnitude of the flaws in basic psychotherapy research methodology. Suggestions are made regarding the future of child and adolescent psychotherapy research.  相似文献   
952.
953.
Bipolar disorder is a serious mental illness affecting a large number of Americans. While lithium, the treatment of choice for this disorder, is usually effective, a substantial number of individuals with bipolar disorder are not helped by lithium or are intolerant to its side effects. Consequently, investigators are searching for alternative drugs in order to treat lithium-resistant patients. Although a number of alternative drug treatments have been discussed in the literature, only the anticonvulsants carbamazepine and valproate appear to warrant serious consideration at this time. Future research will further define their roles as antimanic agents.  相似文献   
954.
955.
956.
In the processing of the waste products of phosphorus containing fertilizer production, several major health-related factors were identified depending on the industrial site's peculiarities: unfavourable microclimate conditions (both cold and heat), relative temperature differences, noise and vibration caused by the equipment, semi-product's, additives' and finished product's dusts, fluorine- and phosphorus-containing substances' affects and poor illumination. The proposed data were used for health-related improvements in the occupational conditions.  相似文献   
957.
NTS fallout-induced multiple myeloma in Utah.   总被引:1,自引:0,他引:1  
  相似文献   
958.
959.
960.
We developed a method for evaluating food group intake patterns using dietary recall data (n = 11,529) from the second National Health and Nutrition Examination Survey. We used this method to examine the relationship of these food group intake patterns to nutrient intake and to selected biochemical indexes of nutritional status. We evaluated each 24-hour dietary intake recall for the presence or omission of five broad food groups--dairy, meat, grain, fruit, and vegetable. The five most prevalent patterns and the proportion of the population reporting them was as follows: all food groups, 33.6%; no fruit, 23.9%; no dairy and fruit, 9.0%; no dairy, 8.0%; and no fruit and vegetable, 5.6%. In the most prevalent pattern, all food groups were consumed; this was the only pattern that provided mean amounts of all of the key vitamins and minerals at levels greater than or equal to the Recommended Dietary Allowances (RDAs). This pattern also was reported by the lowest proportion of individuals consuming less than 100% RDA of the key nutrients. Patterns in which both fruit and vegetables were consumed were associated with highest levels of serum vitamin C. The consistency of these results indicates that screening diets for food group consumption can quickly provide meaningful information about their quality.  相似文献   
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