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   35011篇
  免费   2771篇
  国内免费   422篇
耳鼻咽喉   366篇
儿科学   1025篇
妇产科学   615篇
基础医学   5071篇
口腔科学   522篇
临床医学   3356篇
内科学   7586篇
皮肤病学   774篇
神经病学   2661篇
特种医学   1305篇
外国民族医学   16篇
外科学   4273篇
综合类   1283篇
现状与发展   1篇
一般理论   3篇
预防医学   2768篇
眼科学   687篇
药学   2594篇
  6篇
中国医学   625篇
肿瘤学   2667篇
  2023年   273篇
  2022年   671篇
  2021年   1122篇
  2020年   696篇
  2019年   881篇
  2018年   1084篇
  2017年   777篇
  2016年   777篇
  2015年   944篇
  2014年   1189篇
  2013年   1535篇
  2012年   2245篇
  2011年   2251篇
  2010年   1390篇
  2009年   1143篇
  2008年   1653篇
  2007年   1699篇
  2006年   1618篇
  2005年   1531篇
  2004年   1360篇
  2003年   1299篇
  2002年   1230篇
  2001年   1131篇
  2000年   1121篇
  1999年   994篇
  1998年   350篇
  1997年   303篇
  1996年   266篇
  1995年   215篇
  1994年   213篇
  1993年   177篇
  1992年   523篇
  1991年   502篇
  1990年   483篇
  1989年   433篇
  1988年   456篇
  1987年   381篇
  1986年   373篇
  1985年   366篇
  1984年   256篇
  1983年   187篇
  1982年   119篇
  1981年   105篇
  1979年   211篇
  1978年   111篇
  1977年   125篇
  1976年   114篇
  1974年   130篇
  1972年   128篇
  1969年   104篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
In 7 cases of mandibular laterognathia caused by condylar hypertrophy, the authors specify the clinical and teleradiological features in adolescents. They emphasize the inadequacy of lateral teleradiography and of its measurements, and the need for three-dimensional investigation. In adolescents, secondary deformations, either spontaneous or therapeutic, are rare, and the treatment preferred is condylectomy based on the study of casts. The immediate results of this techniques are satisfactory. The long-term consequences on growth and temporomandibular pathology have been studied.  相似文献   
52.
This double blind, placebo-controlled trial was designed to determine whether intervention with a stepped regimen of trimethoprim-sulfamethoxazole (TMP-SMX) and prednisone would prevent high risk children from developing chronic otitis media with effusion (OME) and recurrent acute otitis media. Forty-two children were enrolled, assigned to treatment with active drug or placebo and then examined at 2-week intervals. They received TMP-SMX (or placebo) during the first 2 weeks, TMP-SMX and prednisone (or placebo) during Weeks 3 and 4 for persistent OME and TMP-SMX (or placebo) for Weeks 5 and 6 if OME was still unresolved. After treatment 48% of active drug and 14% of placebo subjects resolved OME bilaterally (P less than 0.05). Active drug subjects also had fewer acute otitis media episodes than placebo subjects while receiving study treatment (P less than 0.01). Although this treatment regimen produced short term OME resolution, long term benefits were not demonstrated.  相似文献   
53.
以15例角膜移植术的护理实践,总结出该手术的护理常规,并对本组病例中发生的并发症的护理进行了讨论,强调护士密切观察病情,有效地处理并嫌下对手术成功的重要性。  相似文献   
54.

Background  

This study compared the prognostic value of exercise single-photon emission computed tomographic (SPECT) thallium imaging with that of treadmill exercise score in medically treated patients with coronary artery disease (CAD)  相似文献   
55.
56.
Of all the neoplastic conditions of the lymphatic system, Non-Hodgkin's lymphoma (NHL) represents a heterogenous group. As well as lymph nodes NHL can involve extranodal sites, including regions in head and neck. The mouth and oropharynx are typical extranodal sites, and the ENT surgeon should be aware of this possibility of the swift diagnosis of NHL is to be made. We report two patients with rare invasion of the middle ear, facial nerve paresis, and asymptomatic cerebral involvement by Non-Hodgkin's lymphoma.  相似文献   
57.
58.
    
  相似文献   
59.
This prospective study was designed to determine the frequency and natural history of hydroureteronephrosis (HUN) after placement of an aortobifemoral vascular graft. A total of 30 patients were evaluated by the study protocol, which included: pre and postoperative biological kidney function tests, preoperative and early postoperative (14th day) intravenous pyelograms and a late (mean 18th month) urologic examination by renal ultrasonic tomography. Four asymptomatic, early cases of HUN were observed in the 57 ureters examined (7%); all four complications regressed in less than 30 days. No cases of symptomatic early or late HUN were observed in this series. Asymptomatic early HUN was a frequent complication in our series (7%) but its benign course does not justify systematic screening. These asymptomatic complications contrast with the symptomatic cases of early or late HUN reported in the literature which necessitated urologic and vascular investigations.  相似文献   
60.
四种口服头孢菌素的体外抗菌活性的比较研究   总被引:2,自引:0,他引:2  
本文报道口服Cefixime对900株需氧菌和厌氧菌的体外抗菌作用,并与其它口服的头孢克罗、头孢羟氨苄和头孢氨苄进行了比较。Cefixime对链球菌具较强作用,但对葡萄球菌的作用较差;对肠球菌无效。对肠杆菌科细菌的抗菌活性四者之中以Cefixime最强。Cefixime对头孢氨苄耐药株仍具高度活性,其MIC均值可降低60~1200倍以上。绿脓杆菌、硝酸盐阴性杆菌、鲁氏不动杆菌和产碱杆菌对Cefixime和其它3种头孢菌素的敏感性均较差。四者对厌氧菌的作用除厌氧球菌外其抗菌活性都很弱。Cefixime对β-内酰胺酶稳定,口服吸收良好,抗菌作用强,是一个值得进行临床研究的口服头孢菌素。  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