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   901191篇
  免费   62543篇
  国内免费   2337篇
耳鼻咽喉   12519篇
儿科学   28756篇
妇产科学   26158篇
基础医学   126838篇
口腔科学   24725篇
临床医学   74945篇
内科学   183594篇
皮肤病学   19032篇
神经病学   71515篇
特种医学   36531篇
外国民族医学   338篇
外科学   142296篇
综合类   19035篇
一般理论   247篇
预防医学   64610篇
眼科学   20090篇
药学   63897篇
中国医学   1801篇
肿瘤学   49144篇
  2018年   9104篇
  2017年   7190篇
  2016年   7690篇
  2015年   8762篇
  2014年   12413篇
  2013年   19278篇
  2012年   25735篇
  2011年   27348篇
  2010年   16629篇
  2009年   15830篇
  2008年   26179篇
  2007年   27808篇
  2006年   27996篇
  2005年   27516篇
  2004年   26356篇
  2003年   25509篇
  2002年   25119篇
  2001年   41400篇
  2000年   42595篇
  1999年   36307篇
  1998年   9982篇
  1997年   9165篇
  1996年   9091篇
  1995年   8466篇
  1994年   8095篇
  1993年   7589篇
  1992年   28230篇
  1991年   27018篇
  1990年   26444篇
  1989年   25384篇
  1988年   23585篇
  1987年   23185篇
  1986年   22270篇
  1985年   21162篇
  1984年   15818篇
  1983年   13491篇
  1982年   8092篇
  1979年   14599篇
  1978年   10222篇
  1977年   8628篇
  1976年   8154篇
  1975年   8970篇
  1974年   10705篇
  1973年   10189篇
  1972年   9667篇
  1971年   8928篇
  1970年   8590篇
  1969年   8037篇
  1968年   7696篇
  1967年   7096篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
71.
SETTING: Tuberculosis (TB) cases reported from nine districts of Madrid, where the percentage of immigrant population varied from 1.9% in 1996 to 12.2% in 2003. OBJECTIVE: To describe the trends in TB incidence from 1994 to 2003. DESIGN: Observational study. RESULTS: Between 1994-1995 and 2002-2003, the TB rate decreased from 48.5 (95% CI 45.8-51.1) to 23.3 per 100000 population (95% CI 21.5-25.1) (P < 0.001). The percentage of TB cases co-infected with HIV decreased from 55.9% in 1994 to 14.3% in 2003 (P < 0.001), whereas TB cases in foreigners increased from 2.6% in 1994 to 33.7% in 2003 (P < 0.001). CONCLUSION: Although the TB rates showed a marked decrease in the study period, the increasing impact of immigration contributed to slowing down the trend.  相似文献   
72.

The Centers for Disease Control and Prevention (CDC) and 35 partner organizations have engaged in developing an agenda for Preconception Health. A summit was held in June 2005 to discuss the current state of knowledge regarding preconception care and convene a select panel to develop recommendations and action steps for improving the health of women, children, and families through advances in clinical care, public health, and community action. A Select Panel on Preconception Care, convened by CDC, deliberated critical related issues and created refined definition of preconception care. The panel also developed a strategic plan with goals, recommendations, and action steps for improving preconception health. The recommendations and action steps are specific to the implementation of health behavior, access, consumer demand, research, and surveillance activities for monitoring and improving the health of women, children and families. The outcome of the deliberations is the CDC publication of detailed recommendations and action steps in the Morbidity and Mortality Weekly Report series, Recommendations and Reports.

  相似文献   
73.
74.
75.
76.
77.
78.
Our group have studied a patient affected by a malignant schwannoma in the posterior tibial nerve. Schwannomas are uncommon neoplasms that originate from the Schwann cells of the peripheral nerves: the most common forms are benign. Malignant transformation is rarer. The therapy is surgical and the operation undertaken, if possible, should be the amputation. Alternatively, where amputation is not possible due to the specific localisation or due to patient refusal, the alternative must be the largest and most radical excision possible.  相似文献   
79.
To examine the prevalence of Internet sex networking among men who have sex with men (MSM) in Hong Kong and risk behaviors associated with the behavior, a telephone survey of 15,230 Hong Kong Chinese men aged 18-60 was conducted. Of the 283 active MSM (having engaged in some MSM behaviors in the last 6 months) identified, 17.7% had networked for MSM partners via the Internet in the last 6 months. Younger age (odds ratio [OR] for age < or = 25 vs. age >25 = 4.67, 95% confidence interval [CI] = 2.35-9.28) and being an anal-sex MSM (OR = 4.72, 95% CI=2.36-9.44) were independent predictors of Internet sex networking. Being an Internet sex networker was associated with some risk behaviors such as having contracted a sexually transmitted disease (adjusted OR = 4.79, 95% CI = 1.34-17.11), having had > or = 3 MSM partners (adjusted OR = 4.74, 95% CI = 2.20-10.23), and having engaged in anal sex (adjusted OR = 3.95, 95% CI = 1.89-8.23). HIV prevention programs for MSM should thereby include Internet-based interventions.  相似文献   
80.
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