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   20539篇
  免费   2036篇
  国内免费   47篇
耳鼻咽喉   266篇
儿科学   840篇
妇产科学   551篇
基础医学   2891篇
口腔科学   656篇
临床医学   2478篇
内科学   3845篇
皮肤病学   370篇
神经病学   1702篇
特种医学   1058篇
外科学   2367篇
综合类   518篇
一般理论   9篇
预防医学   2058篇
眼科学   295篇
药学   1592篇
  1篇
中国医学   25篇
肿瘤学   1100篇
  2021年   299篇
  2020年   183篇
  2019年   299篇
  2018年   365篇
  2017年   282篇
  2016年   307篇
  2015年   340篇
  2014年   459篇
  2013年   673篇
  2012年   799篇
  2011年   828篇
  2010年   568篇
  2009年   524篇
  2008年   852篇
  2007年   859篇
  2006年   891篇
  2005年   755篇
  2004年   729篇
  2003年   675篇
  2002年   683篇
  2001年   644篇
  2000年   675篇
  1999年   560篇
  1998年   354篇
  1997年   312篇
  1996年   329篇
  1995年   284篇
  1994年   264篇
  1993年   312篇
  1992年   468篇
  1991年   443篇
  1990年   441篇
  1989年   484篇
  1988年   468篇
  1987年   363篇
  1986年   389篇
  1985年   422篇
  1984年   283篇
  1983年   231篇
  1982年   180篇
  1981年   198篇
  1979年   219篇
  1978年   196篇
  1977年   223篇
  1976年   190篇
  1975年   171篇
  1974年   172篇
  1973年   181篇
  1972年   169篇
  1971年   163篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
21.
22.
23.
Although tumors consisting of a combination of transitional cell carcinoma (TCC) and adenocarcinoma have been described in the endometrium, they have not been documented in the uterine cervix to our knowledge. Three such cervical cases are reported in this article. Three patients, whose ages ranged from 40 to 61 years, presented with vaginal bleeding and malignant cells on routine Papanicolaou smears. The initial diagnoses based on a biopsy specimen were poorly differentiated squamous cell carcinoma in two patients and adenocarcinoma with a solid component in the third patient. All patients underwent radical hysterectomy. The hysterectomy specimens each contained a polypoid endocervical mass with minimal invasion of the cervical stroma. On microscopic examination, each tumor consisted of a component of papillary TCC admixed with an adenocarcinoma of endometrioid type. Both carcinomatous components were immunoreactive for cytokeratin (CK) 7 but not CK20. The three patients were alive and disease-free from 10 months to 4 years postoperatively. Recognition of this unusual variant of cervical carcinoma is important to delineate its clinical and pathologic features and establish prognostic differences, if any, from other histologic subtypes of cervical carcinoma. Papillary TCC mixed with adenocarcinoma broadens the morphologic spectrum of transitional cell neoplasms of the uterine cervix.  相似文献   
24.
This study evaluated the effectiveness of early orthodontic treatment with the Twin-block appliance for the developing Class II Division 1 malocclusion. This multicenter trial was carried out in the United Kingdom. A total of 174 children, aged 8 to 10 years old, with Class II Division 1 malocclusion were randomly allocated to receive treatment with a Twin-block appliance or to an untreated, control group. Data were collected at the start of the study and 15 months later. Results showed that early treatment with Twin-block appliances resulted in reduction of overjet, correction of molar relationships, and reduction in severity of malocclusion. Most of this correction was due to dentoalveolar change, but some was due to favorable skeletal change. Early treatment with the Twin-block appliance is effective in reducing overjet and severity of malocclusion. The small change in the skeletal relationship might not be considered clinically significant.  相似文献   
25.
26.
The purposes of the present study of chronic pain patients were to (a) assess whether cognitive and behavioral coping style is related to personality factors, (b) assess how coping styles differ across personality types, and (c) assess how outpatient interdisciplinary intervention affects the coping styles of various personality types. Four MMPI clusters (Depression/Pathological, V-type, Marginal Depression, and Marginal V-type) were derived using a hierarchical clustering procedure. Seventy subjects also completed the Coping Strategies Questionnaire before and after a 3-week outpatient pain management program. Pretreatment analyses indicated the Depression/Pathological and Marginal Depression groups used diverting attention less than either V-type group. The V-type group reported using praying/hoping significantly more than either of the marginal groups. At posttreatment the Depression/Pathological group used catastrophizing significantly more than either of the marginal groups. Results of pre-post analyses indicated that the Depression/Pathological group increased their use of diverting attention, reinterpreting pain sensations, and ignoring pain sensations, while decreasing catastrophizing. The V-type group increased their use of reinterpreting pain sensations, while decreasing praying/hoping and catastrophizing. Neither of the Marginal subtypes showed significant pre-post changes in coping strategies. These results suggest that different personality types use different pain coping strategies prior to multidisciplinary treatment. Groups showing more severe psychological distress, perhaps related to an underlying personality disorder, displayed greater changes in coping strategies with treatment, but remained more dysfunctional after treatment. These findings suggest that the alteration of coping strategies may be an important treatment effect needing more individualization to maximize treatment response.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   
27.
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