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   147638篇
  免费   32395篇
  国内免费   2388篇
耳鼻咽喉   5154篇
儿科学   5329篇
妇产科学   2362篇
基础医学   2899篇
口腔科学   1461篇
临床医学   26473篇
内科学   46746篇
皮肤病学   7391篇
神经病学   14638篇
特种医学   6296篇
外科学   40672篇
综合类   227篇
现状与发展   72篇
预防医学   6918篇
眼科学   3336篇
药学   882篇
中国医学   8篇
肿瘤学   11557篇
  2024年   512篇
  2023年   4777篇
  2022年   1147篇
  2021年   3040篇
  2020年   6005篇
  2019年   2121篇
  2018年   7341篇
  2017年   7304篇
  2016年   8372篇
  2015年   8362篇
  2014年   15421篇
  2013年   15536篇
  2012年   5346篇
  2011年   5343篇
  2010年   10271篇
  2009年   14175篇
  2008年   5670篇
  2007年   3887篇
  2006年   6369篇
  2005年   3649篇
  2004年   2922篇
  2003年   1904篇
  2002年   1992篇
  2001年   3770篇
  2000年   2985篇
  1999年   3187篇
  1998年   3627篇
  1997年   3448篇
  1996年   3354篇
  1995年   3201篇
  1994年   1933篇
  1993年   1555篇
  1992年   1346篇
  1991年   1400篇
  1990年   1049篇
  1989年   1169篇
  1988年   1007篇
  1987年   831篇
  1986年   880篇
  1985年   710篇
  1984年   541篇
  1983年   514篇
  1982年   507篇
  1981年   392篇
  1980年   354篇
  1979年   306篇
  1978年   329篇
  1977年   397篇
  1975年   277篇
  1972年   279篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
991.
992.
993.
Nonoperative treatment is generally the choice for Type I and II acromioclavicular (AC) joint injuries. The situation issomewhat more controversial when Type III AC dislocations are considered, particularly with respect to athletes and heavy laborers. A number of recent studies have supported conservative treatment in these groups. There is general consensus as to the need for surgical intervention for Type IV, V, and VI AC injuries. Integral to any form of management, nonoperative or operative, is a rehabilitation program that addresses range of motion, strength, and neuromuscular control. We describe our program, which is divided into four phases: (1) Pain control and immediate protected range of motion and isometric exercises; (2) strengthening exercises using isotonic contractions and proprioceptive neuromuscular facilitation (PNF) exercises; (3) Unrestricted functional participation with the goal of increasing strength, power, endurance, and neuromuscular control; and (4) return to activity with sport specific functional drills. An athlete is ready to return to competitive sports once the following criteria are met: full range of motion (ROM), no pain or tenderness, satisfactory clinical exam, and demonstration of adequate strength on isokinetic testing. The unique considerations in a throwing athlete with an AC injury are also addressed. The primary goal of the nonoperative treatment protocol is to return the athlete to full activities as quickly and as safely as possible.  相似文献   
994.
995.
996.
997.
Background: Considerable debate exists concerning the prognosis of breast cancer in male patients compared with that in female patients. Some studies have observed worse prognosis for men; others suggested the higher mortality rates were primarily due to delayed diagnosis. Methods: Survival time from diagnosis with invasive disease to death resulting from breast cancer of 58 men treated between 1973 and 1989 was compared with survival of 174 women treated between 1976 and 1978 who were matched by stage of disease and age at diagnosis. All patients were treated by mastectomy and axillary dissection. Results: Tumors were ⩽2 cm in 70% of cases and 55% were free of axillary metastases. The histology of the tumors differed significantly by gender (p<0.05). Significantly more men had estrogen receptor-positive tumors (87%) than did women (55%, p<0.001). Survival at 10 years was similar for male and female patients. Multivariate analysis controlling for tumor size, number of positive axillary lymph nodes, age at diagnosis, histology, and receptor status indicated no significant difference in survival of male compared with female patients. Conclusions: These data conflict with the conventional wisdom that breast cancer in men carries a worse prognosis than the disease in women. Although histology of the tumor and receptor status differed by gender, these factors did not have an impact on survival in these paired patients. Our data indicate that breast carcinoma in males is not biologically more aggressive than in females. Presented at the 49th Annual Cancer Symposium of The Society of Surgical Oncology, Atlanta, Georgia, March 21–24, 1996.  相似文献   
998.
999.
A case is presented of a 16-year-old girl with ectodermal dysplasia for whom dental surgery under general anaesthesia was planned. Following a priming dose of vecuronium, and immediately after injection of sodium thiopentone (5 mg·kg−1) pulmonary aspiration of gastric contents occurred. It is hypothesized that, because of the rapid speed of onset of neuromuscular blocking agents on the laryngeal muscles, that partial laryngeal paralysis was present at the time of induction of anaesthesia and that this was responsible in part for the episode of pulmonary aspiration.  相似文献   
1000.
Perceptions of family cohesion and hierarchy structures were assessed by theFamily System Test (FAST), a clinically-derived figure placement technique. Parents (N=140) and their preadolescent offspring (N=70) completed typical and conflict representations in individual as well as group settings. Typical representations were characterized by balanced family structures (i.e. cohesive and moderately hierarchical) and those displaying conflict situations showed predominantly unbalanced patterns. FAST portrayals were related to respondent (mother vs. father vs. child). Fathers represented typical family relations as balanced more often than mothers. Regarding conflict representations, children were more likely than fathers to portray the family as unbalanced. However, analyses of representations of the same family (i.e. intra-family comparisons) indicated that all respondents differed in their perceptions and, that fathers' typical portrayals showed most often the same structure as those done by the family members as a group.  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