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   7631篇
  免费   583篇
  国内免费   17篇
耳鼻咽喉   33篇
儿科学   191篇
妇产科学   92篇
基础医学   1088篇
口腔科学   255篇
临床医学   718篇
内科学   1767篇
皮肤病学   296篇
神经病学   487篇
特种医学   334篇
外科学   1078篇
综合类   145篇
一般理论   3篇
预防医学   663篇
眼科学   256篇
药学   316篇
  1篇
肿瘤学   508篇
  2021年   77篇
  2019年   72篇
  2018年   83篇
  2017年   74篇
  2016年   68篇
  2015年   77篇
  2014年   128篇
  2013年   219篇
  2012年   233篇
  2011年   276篇
  2010年   166篇
  2009年   155篇
  2008年   318篇
  2007年   323篇
  2006年   289篇
  2005年   278篇
  2004年   269篇
  2003年   232篇
  2002年   212篇
  2001年   277篇
  2000年   210篇
  1999年   206篇
  1998年   94篇
  1997年   94篇
  1996年   68篇
  1992年   226篇
  1991年   190篇
  1990年   204篇
  1989年   184篇
  1988年   159篇
  1987年   195篇
  1986年   174篇
  1985年   188篇
  1984年   136篇
  1983年   106篇
  1982年   79篇
  1981年   87篇
  1980年   76篇
  1979年   128篇
  1978年   90篇
  1977年   89篇
  1976年   73篇
  1975年   87篇
  1974年   91篇
  1973年   107篇
  1972年   81篇
  1971年   75篇
  1970年   82篇
  1969年   89篇
  1968年   76篇
排序方式: 共有8231条查询结果,搜索用时 0 毫秒
1.
2.
A 24-year-old man presented with acute pancreatitis. Serial ultrasonographic examination showed the development of bright echoes within the pancreatic parenchyma compatible with gas formation. This was confirmed on subsequent computed tomography and at laparotomy. The value of serial ultrasonographic examinations in pancreatitis is emphasized.  相似文献   
3.
Three children with malignant primary CNS tumors treated with craniospinal radiotherapy developed intraparenchymal hemorrhages a median of 5 years following therapy in sites distant from the primary tumor. Radical surgical procedures disclosed fresh and old hematoma, gliosis, and necrosis in all 3 patients and an aggregation of abnormal microscopic blood vessels in two. No tumor was found. All 3 patients remain in long-term (greater than 10 years) continuous remission.  相似文献   
4.
5.

Background  

Pulmonary dysfunction following cardiac surgery is believed to be caused, at least in part, by a lung vascular injury and/or atelectasis following cardiopulmonary bypass (CPB) perfusion and collapse of non-ventilated lungs.  相似文献   
6.
7.

Background  

Shoulder disorders are a common health problem in western societies. Several treatment protocols have been developed for the clinical management of persons with shoulder pain. However available evidence does not support any protocol as being superior over others. Systematic reviews provide some evidence that certain physical therapy interventions (i.e. supervised exercises and mobilisation) are effective in particular shoulder disorders (i.e. rotator cuff disorders, mixed shoulder disorders and adhesive capsulitis), but there is an ongoing need for high quality trials of physical therapy interventions. Usually, physical therapy consists of active exercises intended to strengthen the shoulder muscles as stabilizers of the glenohumeral joint or perform mobilisations to improve restricted mobility of the glenohumeral or adjacent joints (shoulder girdle). It is generally accepted that a-traumatic shoulder problems are the result of impingement of the subacromial structures, such as the bursa or rotator cuff tendons. Myofascial trigger points (MTrPs) in shoulder muscles may also lead to a complex of symptoms that are often seen in patients diagnosed with subacromial impingement or rotator cuff tendinopathy. Little is known about the treatment of MTrPs in patients with shoulder disorders.  相似文献   
8.
9.
The magnitude and dynamics of lung cancer incidence in Jews and Arabs in Israel between the years 1962 and 1982 were studied. In general, age-standardized incidence rates increased consistently between the years 1962 and 1976 among Jewish (24% increase) and Arab (39%) males, and to a lesser degree among Jewish females (15%). Arab females had the highest (77%) increase. From 1977 to 1982 a general decrease in incidence rates, which was largest among Arab males (19%) and females (15%), was noted. Rates among Jewish males are currently 26% higher than among Arab males, and are 162% higher among Jewish females than in Arab females. Lung cancer rates in both males and females in Istrael (Jews and Arabs) are lower than in most developed countries in the world. Among the possible reasons are differences in the population risk factors profile, availability of health care and the level of diagnosis and ascertainment of cases.  相似文献   
10.
Current knowledge about alcohol and marital functioning is limited by restrictive sample selection, inattention to the literature on individual-based alcoholic subtypes, and lack of research linking individual differences among alcoholics to marital functioning. The present study was designed to study marital functioning of alcoholics in light of current alcohol typologies. Subjects were part of a larger study on conjoint treatment of alcoholic males and their female partners. Four typologies—including Type 1/2, In-Home/Out-of-home, SteadyIEpisodic, and EarlyILate Onset—were tested for replicability and discriminant validity before linking them to marital functioning. Discriminant validity was found only for the Early (59%)-versus Late (41 %)-Onset typology; thus, further analyses linked only this typology with marital functioning. At baseline, Early-Onset couples reported more marital instability, and the females in these couples were more distressed. During treatment, Early-Onset couples reported higher daily marital satisfaction than Late-Onset couples. Regardless of age of onset, males reported higher marital satisfaction than their spouses during treatment, but their satisfaction did not increase during treatment. Female partners' marital satisfaction increased during treatment. Female partners of Late-Onset males reported particularly low marital satisfaction during treatment. Parsing the sample according to the early-/late-onset typology yielded different predictors of marital satisfaction for males and females within each subtype. For female partners of Early-Onset alcoholics, psychological distress unrelated to her pattner's drinking severity was most associated with her own marital satisfaction, whereas marital adjustment of female partners of Late-Onset alcoholics was most associated with the male's level of perceptual accuracy regarding her needs. This pattern was reversed for the males; marital adjustment of Early-Onset alcoholics was most associated with his partner's perceptual accuracy of his needs, whereas marital functioning of Late-Onset alcoholics was best accounted for by his own psychological distress.  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