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   5560篇
  免费   641篇
  国内免费   168篇
耳鼻咽喉   55篇
儿科学   218篇
妇产科学   135篇
基础医学   124篇
口腔科学   78篇
临床医学   1220篇
内科学   1230篇
皮肤病学   113篇
神经病学   413篇
特种医学   179篇
外科学   1576篇
综合类   11篇
预防医学   314篇
眼科学   325篇
药学   161篇
肿瘤学   217篇
  2023年   106篇
  2021年   61篇
  2020年   95篇
  2019年   40篇
  2018年   126篇
  2017年   171篇
  2016年   183篇
  2015年   136篇
  2014年   221篇
  2013年   296篇
  2012年   100篇
  2011年   114篇
  2010年   228篇
  2009年   341篇
  2008年   120篇
  2007年   67篇
  2006年   110篇
  2005年   72篇
  2003年   50篇
  2002年   48篇
  2001年   107篇
  2000年   82篇
  1999年   130篇
  1998年   175篇
  1997年   201篇
  1996年   301篇
  1995年   254篇
  1994年   195篇
  1993年   118篇
  1992年   126篇
  1991年   143篇
  1990年   71篇
  1989年   135篇
  1988年   104篇
  1987年   82篇
  1986年   108篇
  1985年   97篇
  1984年   89篇
  1983年   85篇
  1982年   69篇
  1981年   71篇
  1980年   83篇
  1979年   45篇
  1978年   65篇
  1977年   46篇
  1976年   53篇
  1975年   56篇
  1972年   39篇
  1964年   49篇
  1963年   47篇
排序方式: 共有6369条查询结果,搜索用时 15 毫秒
31.
A TEN-YEAR HOSPITAL SURVEY OF EYELID CANCER   总被引:1,自引:0,他引:1  
Two hundred and four cases of malignant eyelid tumours, managed at the Concord Hospital, were reviewed. These cases spanned a ten-year period between 1973 and 1982 and all were treated surgically. The nature of each tumour was confirmed by histopathological examination. Included in this review were the site of the tumour, the tumour pathology, the surgical management, the type of surgeon involved, the ocular complications, the management of recurrences and any mortality. The importance of preventing recurrences by adequate initial surgery with frozen section control is emphasized.  相似文献   
32.
Exophthalmometry, the quantitative assessment of the position of the globe in the orbit, is a clinically useful measurement. The purpose of this study was to examine the performance of a simple exophthal-mometer that would lend itself to accurate and convenient use in clinical practice. In this study, two observers independently performed exophthalmometry on 100 eyes using the Hertel and Luedde instruments. The results were compared between instruments and between observers. There was no statistically or clinically significant difference between measurements taken with the Luedde as compared with the Hertel instrument. The Luedde exophthal-mometer has a number of advantages over the Hertel exophthalmometer, and represents a simple, inexpensive and equally reliable means of evaluating clinically the anteroposterior position of the eye in the orbit.  相似文献   
33.
Twenty-seven women requesting postcoital contraception were randomly allocated to take an ethinylestradiol/dl-norgestrel combination or danazol. Urine specimens were assayed for luteinising hormone (LH) and pregnanediol-3-glucuronide (P3G) levels from the day of the postcoital treatment to the next period. In addition, the urine samples of these recruits and 12 additional women were assayed for the Beta-subunit of human chorionic gonadotropin (B-hCG). A consistent pattern of alteration in urinary steroids was lacking, indicating a heterogenous effect on ovarian function. There was no evidence of early pregnancy in successfully treated cases. We suggest that the main mechanism of action of these drugs is at the endometrial level.  相似文献   
34.
35.
36.
37.
38.
39.
What must be avoided in the nuclear age is wishful thinking. Wishful thinking occurs in an atmosphere of maximum terror (as in Mutual Assured Destruction), and where there is little opportunity for reality testing (as in the East‐West communication barrier). In the small, densely populated island of Britain, the size of today's growing nuclear threat will create responses where delusional thinking can easily dominate. A belief in effective civil defence may induce a sense of false security which may in turn direct attention from the fundamental problem of East‐West mistrust.  相似文献   
40.
This article examines the risk of proliferation of nuclear weapons to several Third World countries, exemplified by recent events in Iraq, and the possibility of rapid acquisition of a nuclear weapons capability in developed countries. It considers the role of the International Atomic Energy Agency and the United Nations in preventing proliferation and calls for wider powers for the latter. The role of the civil nuclear power industry and of reprocessing of nuclear fuel to produce plutonium is stressed, with emphasis on the part played by nuclear power in Japan and the THORP reprocessing plant at Sellafield.  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