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   2549380篇
  免费   199851篇
  国内免费   3969篇
耳鼻咽喉   36290篇
儿科学   86560篇
妇产科学   72111篇
基础医学   362695篇
口腔科学   72872篇
临床医学   225860篇
内科学   498670篇
皮肤病学   54853篇
神经病学   204367篇
特种医学   101713篇
外国民族医学   1064篇
外科学   387943篇
综合类   59952篇
现状与发展   4篇
一般理论   866篇
预防医学   197006篇
眼科学   58565篇
药学   191397篇
  5篇
中国医学   4754篇
肿瘤学   135653篇
  2018年   24829篇
  2016年   21145篇
  2015年   24222篇
  2014年   33653篇
  2013年   51640篇
  2012年   70139篇
  2011年   74300篇
  2010年   44201篇
  2009年   42086篇
  2008年   71125篇
  2007年   75489篇
  2006年   76368篇
  2005年   74345篇
  2004年   72830篇
  2003年   69995篇
  2002年   68606篇
  2001年   119669篇
  2000年   124172篇
  1999年   105431篇
  1998年   28992篇
  1997年   26268篇
  1996年   26555篇
  1995年   25632篇
  1994年   24178篇
  1993年   22626篇
  1992年   86035篇
  1991年   83900篇
  1990年   82114篇
  1989年   78768篇
  1988年   73063篇
  1987年   71962篇
  1986年   67928篇
  1985年   65481篇
  1984年   49070篇
  1983年   42045篇
  1982年   24666篇
  1981年   22193篇
  1980年   20510篇
  1979年   45988篇
  1978年   32089篇
  1977年   27057篇
  1976年   25470篇
  1975年   27180篇
  1974年   32726篇
  1973年   31535篇
  1972年   28999篇
  1971年   26882篇
  1970年   24985篇
  1969年   23200篇
  1968年   21198篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
Bernard–Soulier syndrome (BSS) is a rare autosomal recessively inherited bleeding disorder. Pregnancy in patients with BSS is characterized by ante‐, intra‐, or postpartum haemorrhage, which may be delayed and severe. There is no consensus in the management of BSS in pregnancy and so far only 16 pregnancies in nine patients have been described. We report a further three pregnancies in two women with the syndrome. We also outline our management of pregnant patients with BSS.  相似文献   
34.
Landgraf  R. 《Der Diabetologe》2006,2(1):S5-S8
NAFDM, the National Action Forum for Diabetes Mellitus, is an umbrella organisation for the leading diabetes organisations in Germany. Since its foundation at the end of 2004, NAFDM has brought together the activities of these organisations, which up to now were frequently working independently of each other, under a single ‘roof’. Supported by a central coordination unit, three project groups work successfully on the topics scientific research and healthcare research, patient care and prevention. Activities and results are shared and thus integrated into the network. The working groups are supported by NAFDM’s medical and health-policy steering groups. Apart from a number of successful events, two key publications have meanwhile come out: one on the status of prevention and one analysing the healthcare situation for diabetics in Germany. All people interested in diabetology are invited to join in and work with the NAFDM.  相似文献   
35.
Multi-day signals, generally with duration of 2-10 days, are a prominent temporal variation type of radon (Rn) in geogas in the unsaturated zone. Rare multi-day Rn signals have been found which are characterized by: (a) a declining limb lasting up to 10 days which conforms to the radioactive decay of Rn, (b) recurs at the same location and (c) is recorded in diverse situations-volcanic and seismogenic. It suggested that a Rn blob is injected at a lower level on a steady upward flow of geogas whereby the rise and final fall of the signal are attributed to the edges of the blob while the central Rn-decay segment records the passing of the decaying blob itself. Rn-decay signals are a small subset of multi-day Rn signals which are considered as highly irregular and unusable for the understanding of geophysical processes. In difference, it is concluded that multi-day Rn signals are probably proxies of subtle geodynamic processes at upper crustal levels and are therefore significant for studying such processes.  相似文献   
36.
Conclusion  Several quality-control measures take place before (patient and camera preparation) and during SPECT acquisition to achieve high-quality images. Not uncommonly, technologists and physicians are left with suboptimal images that have to be addressed to reach the “right answer” for patient diagnosis and hence management. In many cases patients may be reimaged, especially if the problem is detected early, but in other cases either the patient has left the nuclear laboratory or there is an inevitable problem that, even with reimaging, will not be resolved. In these situations the technologist and physician have to seek the available techniques to obtain the best images possible. These resources are discussed in this issue as an aid in quality control to obtain the best possible images.  相似文献   
37.
38.

Background  

The Association of Surgeons of Great Britain and Ireland (ASGBI) devised the electronic surgical logbook (version 2.4) for higher trainees in General Surgery enabling trainees to compile a uniform data set of their operative and training experience. This is in use by higher surgical trainees (HST) in the United Kingdom. This logbook permits trainees to submit data centrally into a Regional Analysis Database (RAD). With the implementation of the European Working Time Directive (EWTD) there is need for reliable data to assess the effects of the directive on training. In order to draw meaningful conclusions from the database the quality of data needs to be validated. We critically analysed the RAD in the Yorkshire region for a one-year period.  相似文献   
39.
On September 11, 2001 two hijacked airplanes struck the Twin Towers at the World Trade Center in New York City. All of the remains (19,915) were examined by the Office of Chief Medical Examiner (OCME) of New York City. The major goals of the OCME were to accurately identify the decedents and to promptly issue death certificates. As of September 2005, there were 1594 identifications of a total of 2749 people reported missing. Of these, 976 were identified by a single means, which included DNA analysis in 852 of the victims. Use of legal statues can assist in the timely issuance of death certificates in mass fatalities, which benefit surviving family members. DNA analysis markedly improves the ability to identify remains and has become the standard method for identification in these types of disasters. Certain postmortem tissue samples are better suited for DNA analysis and yield better results than others.  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