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   10485篇
  免费   640篇
  国内免费   15篇
耳鼻咽喉   52篇
儿科学   363篇
妇产科学   269篇
基础医学   1229篇
口腔科学   76篇
临床医学   1762篇
内科学   1806篇
皮肤病学   106篇
神经病学   1106篇
特种医学   212篇
外科学   833篇
综合类   108篇
一般理论   126篇
预防医学   1506篇
眼科学   155篇
药学   753篇
中国医学   7篇
肿瘤学   671篇
  2023年   42篇
  2022年   95篇
  2021年   198篇
  2020年   103篇
  2019年   202篇
  2018年   208篇
  2017年   177篇
  2016年   190篇
  2015年   230篇
  2014年   334篇
  2013年   524篇
  2012年   729篇
  2011年   760篇
  2010年   418篇
  2009年   389篇
  2008年   699篇
  2007年   660篇
  2006年   686篇
  2005年   682篇
  2004年   670篇
  2003年   646篇
  2002年   550篇
  2001年   116篇
  2000年   111篇
  1999年   136篇
  1998年   119篇
  1997年   91篇
  1996年   102篇
  1995年   97篇
  1994年   67篇
  1993年   71篇
  1992年   78篇
  1991年   85篇
  1990年   72篇
  1989年   84篇
  1988年   76篇
  1987年   56篇
  1986年   61篇
  1985年   72篇
  1984年   49篇
  1983年   35篇
  1982年   49篇
  1981年   38篇
  1980年   37篇
  1979年   30篇
  1978年   27篇
  1977年   26篇
  1976年   23篇
  1975年   23篇
  1974年   19篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
141.
142.
Abortion has provided one of the most noxious, disturbing, and unending of all American moral and legal struggles. The issue forces us to think about the most difficult kind of ethical issues, e.g., the moral status of the fetus and the meaning of human "life" and "personhood." The win-at-all-costs attitude among the leading advocacy groups has created gross stereotypes. While most arguments heard today were also heard prior to the Roe vs. Wade decision, the tone has radically changed. Better organization has meant hotter rhetoric and a nastier public style. We need to move the abortion debate along; it is now as stagnate as it is nasty. We need creative discussion and realistic compromise. The pre-Roe arguments in favor of choice have changed. Then, the movement to legalize abortion rested on the following: 1) illegal abortions were killing and maiming women; 2) women should have a backup to ineffective contraception; 3) the number of unwanted pregnancies should be reduced; only wanted children should be born, as a matter of child welfare; 4) women should have the right to make the abortion decision; 5) everything possible should be done to change the economic and domestic circumstances forcing women into unwanted pregnancies. The argument benefited women, children, and society. The many abortion myths that have since taken prominence cloud an already difficult issue. The ongoing tension rests with the conflict between the moral and legal issues. Is it possible to combine legal freedom and seriousness about the moral questions? Only if we recognize the equality of both positions' moral traditions, accept public discussion, the need for compromise, the need to do everything possible to change the economic and social circumstance leading to the abortion choice, and the need for meaningful counseling of women considering abortion.  相似文献   
143.
144.
A case of true hematic cyst of the orbit in a 10-year-old girl, apparently resulting from birth trauma, is presented. Ultrasonic and clinical features believed to aid the examiner in correctly diagnosing such a lesion are presented. While apparently unique among reported cases, "congenital" hematic cysts of the orbit undoubtedly occur occasionally and the possibility of this entity should be considered in appropriate circumstances.  相似文献   
145.
146.
147.
Adamantinoma, a rare bone lesion of the tibia and fibula, has two distinct variants, classic adamantinoma and osteofibrous dysplasia-like adamantinoma. Composite lesions have not been described. Aneurysmal bone cyst is a benign cystic lesion which may also occur in the tibia and fibula. We report an unusual case of classic adamantinoma with osteofibrous dysplasia-like areas and foci of secondary aneurysmal bone cyst with prominent giant cells. A lesion was diagnosed in a 17-year-old girl with a 14-year history of a slowly enlarging left tibial mass and increasing deformity. Pathologically, the predominant pattern was classic adamantinoma, with minor foci of osteofibrous dysplasia-like adamantinoma and areas of secondary aneurysmal bone cyst with abundant multinucleated giant cells. We report the clinical, radiologic, and pathologic features of this case, and summarize lesions associated with secondary aneurysmal bone cyst. To our knowledge, the association of adamantinoma with secondary aneurysmal bone cyst has not been previously reported.  相似文献   
148.
Infantile Systemic Hyalinosis is a rare autosomal recessive entity, characterised by deposition of hyaline material in skin and bone, often complicated by visceral involvement. The characteristic features are marked delay in motor milestones attributed to severe progressive flexion contractures of proximal and distal joints, and skin and mucosal hypertrophy and thickening, followed by failure to thrive. Pain secondary to osteolytic lesions is also a predominant feature. We report a patient with Infantile Systemic Hyalinosis, confirmed by the clinical findings, who also displayed clear evidence of proximal muscle weakness. Muscle biopsy revealed myopathic changes, which have not been reported previously. We suggest that skeletal muscle is involved in Infantile Systemic Hyalinosis and contributes to the characteristic poor outcome of these patients.  相似文献   
149.
150.
PURPOSE: The practice patterns of medical oncologists at a large National Cancer Institute Comprehensive Cancer Center in Detroit, MI were evaluated to better understand factors associated with accrual to breast cancer clinical trials. PATIENTS AND METHODS: From 1996 to 1997, physicians completed surveys on 319 of 344 newly evaluated female breast cancer patients. The 19-item survey included clinical data, whether patients were offered clinical trial (CT) participation and enrollment, and when applicable, reasons why they were not. Multivariate analyses using logistic regression were performed to evaluate predictors of an offer and enrollment. RESULTS: The patients were 57% white, 32% black, and 11% other/unknown race. One hundred six (33%) were offered participation and 36 (34%) were enrolled. In multivariate analysis, CTs were less likely offered to older women (mean age, 52 years for those offered v 57 years for those not offered; P =.0005) and black women (21% of blacks offered v 42% of whites; P =.0009). Women with stage 1 disease, poor performance status, and those who were previously diagnosed were also less likely to be offered trials. None of these factors were significant predictors of enrollment. Women were not offered trials because of ineligibility (57%), lack of available trials (41%), and noncompliance (2%). Reasons for failed enrollment included patient refusal (88%) and failed eligibility (12%). CONCLUSION: It is important for cooperative groups to design studies that will accommodate a broader spectrum of patients. Further work is needed to assess ways to improve communication about breast cancer CT participation to all eligible women.  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