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   32447篇
  免费   2698篇
  国内免费   72篇
耳鼻咽喉   545篇
儿科学   1335篇
妇产科学   1122篇
基础医学   4499篇
口腔科学   839篇
临床医学   2804篇
内科学   7705篇
皮肤病学   747篇
神经病学   3329篇
特种医学   1005篇
外国民族医学   3篇
外科学   3938篇
综合类   539篇
一般理论   44篇
预防医学   2324篇
眼科学   633篇
药学   1792篇
中国医学   8篇
肿瘤学   2006篇
  2021年   435篇
  2020年   310篇
  2019年   475篇
  2018年   540篇
  2017年   391篇
  2016年   435篇
  2015年   485篇
  2014年   669篇
  2013年   1015篇
  2012年   1325篇
  2011年   1400篇
  2010年   816篇
  2009年   703篇
  2008年   1257篇
  2007年   1349篇
  2006年   1337篇
  2005年   1289篇
  2004年   1293篇
  2003年   1173篇
  2002年   1230篇
  2001年   1105篇
  2000年   1175篇
  1999年   990篇
  1998年   379篇
  1997年   315篇
  1996年   333篇
  1995年   302篇
  1994年   295篇
  1993年   307篇
  1992年   876篇
  1991年   819篇
  1990年   691篇
  1989年   733篇
  1988年   687篇
  1987年   714篇
  1986年   661篇
  1985年   684篇
  1984年   545篇
  1983年   472篇
  1982年   308篇
  1980年   262篇
  1979年   467篇
  1978年   312篇
  1977年   268篇
  1976年   287篇
  1975年   273篇
  1974年   305篇
  1973年   300篇
  1972年   269篇
  1971年   267篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
The association between the periodontal diagnosis and a variety of subject characteristics was studied in a group of 1,783 patients examined at a large military dental clinic. In order of importance, age greater than 30, smoking, male sex, and Filipino racial background were all found to be statistically significant risk indicators for the presence of moderate or advanced periodontitis. A logistic regression equation serving as a predictive model employing these four variables was presented. The strong association found between smoking and advanced periodontitis is consistent with the hypothesis that smoking has cumulative detrimental effects on periodontal health. While these and other risk indicators are neither causative, diagnostic, nor prognostic, they may be helpful in alerting the clinician to more carefully evaluate other clinical signs or laboratory findings of disease.  相似文献   
32.
33.
This study was designed to evaluate the use of salivary cotinine, salivary thiocyanate, and expired-air carbon monoxide as biochemical validation measures for assessing the smoking status of adults. The participants were 20 known non-smokers plus 216 admitted smokers and 102 proclaimed quitters participating in a clinical trial of approaches to facilitate smoking cessation. Conventional analytical procedures were utilized. By use of data from known non-smokers and admitted smokers, the sensitivity and specificity of the validation measures were as follows: salivary cotinine, 99% and 100%; expired-air carbon monoxide, 96% and 100%; and salivary thiocyanate, 67% and 95%, respectively. The salivary cotinine and expired-air carbon monoxide tests confirmed smoking cessation for 55% and 74%, respectively, of the proclaimed quitters. The length of time since quitting was significantly related to the results observed with the latter measures. Consideration of these observations along with various practical factors suggests that expired-air carbon monoxide assays may be the validation measure of choice for most clinical trials.  相似文献   
34.
35.
36.
37.
38.
A series of tables is presented as a diagnostic aid for the clinician when he confronts a patient who has a cleft lip and/or palate, together with associated anomalies. The tables provide a rapid way of sorting through the recognized syndromes with orofacial clefting in search of a possible overall diagnosis. Today, 154 such syndromes are recognized. This is more than twice as many as were known in 1971. Undoubtedly, many new syndromes with orofacial clefting will be delineated in the future.  相似文献   
39.
All dentists in active practice in Rhode Island were surveyed to determine their attitudes toward continuing education in TEAM. A total of 74.6 percent of those surveyed responded to the questionnaire. Only one variable, location in a building with other dental offices, was found to be associated with a perceived need for training in TEAM. Demographic background, practice busyness, practice efficiency, and knowledge and attitude profiles were found to be associated with an interest in attending such continuing education courses.  相似文献   
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