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   58234篇
  免费   3431篇
  国内免费   42篇
耳鼻咽喉   889篇
儿科学   1741篇
妇产科学   1355篇
基础医学   8680篇
口腔科学   2155篇
临床医学   5476篇
内科学   10492篇
皮肤病学   1443篇
神经病学   6237篇
特种医学   2719篇
外科学   8201篇
综合类   200篇
一般理论   32篇
预防医学   3815篇
眼科学   1161篇
药学   3928篇
中国医学   87篇
肿瘤学   3096篇
  2023年   323篇
  2022年   229篇
  2021年   498篇
  2020年   575篇
  2019年   613篇
  2018年   1297篇
  2017年   1116篇
  2016年   1444篇
  2015年   1152篇
  2014年   1323篇
  2013年   2453篇
  2012年   3089篇
  2011年   3536篇
  2010年   1862篇
  2009年   1179篇
  2008年   3525篇
  2007年   3688篇
  2006年   3462篇
  2005年   3367篇
  2004年   3230篇
  2003年   3279篇
  2002年   3196篇
  2001年   2529篇
  2000年   3258篇
  1999年   1718篇
  1998年   553篇
  1997年   476篇
  1996年   352篇
  1995年   290篇
  1994年   312篇
  1993年   297篇
  1992年   276篇
  1991年   221篇
  1990年   217篇
  1989年   277篇
  1988年   209篇
  1987年   216篇
  1986年   220篇
  1985年   279篇
  1984年   317篇
  1983年   261篇
  1982年   254篇
  1981年   210篇
  1980年   202篇
  1979年   230篇
  1978年   172篇
  1977年   187篇
  1976年   187篇
  1975年   166篇
  1973年   168篇
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
21.
22.
23.
Type 1 diabetes is one of the commonest chronic disorders encountered in children and adolescents. When it first becomes apparent in children, approximately 20% of them have clinical and biochemical signs of ketoacidosis (DKA). In the presence of unusual clinical symptoms it is necessary to consider the possibility of associated conditions, such as coeliac disease, immunothyroiditis and Addison’s disease. Children with diabetes must be treated by a multidisciplinary team made up of paediatrician, paediatric diabetes specialist, psychologist, social worker, ophthalmologist, dietitian, nurse and diabetes counsellor, making it essential for them to be treated in regional specialised centres. They are treated in their own psychosocial environment and their families are involved in the therapy. Comprehensive, multidisciplinary treatment strategies have now made it possible for these patients to enjoy normal physical wellbeing and near-normal psychosocial development. Prevention and early treatment of of disturbances associated with diabetes remain an important concern. The fact that type 2 diabetes must now be looked for in overweight children and adolescents is a new aspect of diabetes medicine.  相似文献   
24.
25.
26.
Transforaminal injections are sometimes used for the diagnosis and treatment of painful conditions in the lumbar and to a lesser degree in the cervical spine. The technique is most often used when investigating/treating radiculopathy caused by degenerative disease. But how selective are the nerve root blocks? What possible structures other than the intended nerve root are affected from such injections? This study was undertaken in order to try to answer these questions, as no study focusing on the possible spread from the transforaminal selective nerve root blocks in the cervical spine has been performed earlier. In three groups of patients, each group including three patients, we injected three different volumes (0.6, 1.1 and 1.7 ml) with a transforaminal technique in the cervical spine. In all the injections, a small amount of contrast media was added. The spread of the injections were then investigated using multi-slice computed tomography with reconstructions. The imaging revealed a possible effect on other nerve roots than the intended ones when a larger volume was used for the root blocks. The spread was related to the injected volume as well as to local anatomy (size of foraminal area). In this study, only 0.6-ml injections could be accepted for being selective enough for diagnostic investigations.  相似文献   
27.
PATIENTS AND METHOD: The aim of the present study was to contribute to a more accurate indication and better integration of developing third molar transplantation into orthodontic space management, using the results gleaned from the authors' own pool of patients. For this purpose, a clinical and radiographic examination of 61 transplanted developing molars in 57 patients was carried out after an average of 3.3 years. RESULTS: The overall success rate was 85%. Failure was due in 10% of cases to impaired periodontal healing (inflammatory root resorption, ankylosis, or increased pocket probing depths) and in 5% of cases to insufficient or arrested postoperative root development accompanied by increased transplant mobility. The incidence of postoperative cessation of further root development was significantly higher (p = 0.011) in transplants at early developmental stages, which also had a negative impact on the final root length, the crown-root ratio and the mobility values of these transplants. CONCLUSIONS: The transplantation of developing third molars should be given stronger consideration in treatment plans for orthodontic space management although it represents a real alternative to orthodontic space closure only in exceptional cases. However, unlike implantological or prosthodontic treatment, it offers an opportunity to replace a missing or non-retainable tooth with a patient's own vital and fully functional tooth, provided the appropriate transplant is selected.  相似文献   
28.
29.
30.
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