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   900042篇
  免费   62470篇
  国内免费   2334篇
耳鼻咽喉   12475篇
儿科学   28690篇
妇产科学   26162篇
基础医学   126613篇
口腔科学   24691篇
临床医学   74790篇
内科学   183199篇
皮肤病学   18997篇
神经病学   71416篇
特种医学   36453篇
外国民族医学   336篇
外科学   142138篇
综合类   19044篇
一般理论   247篇
预防医学   64655篇
眼科学   20188篇
药学   63825篇
中国医学   1798篇
肿瘤学   49129篇
  2018年   9057篇
  2017年   7171篇
  2016年   7679篇
  2015年   8733篇
  2014年   12382篇
  2013年   19234篇
  2012年   25667篇
  2011年   27275篇
  2010年   16587篇
  2009年   15793篇
  2008年   26148篇
  2007年   27749篇
  2006年   27931篇
  2005年   27467篇
  2004年   26312篇
  2003年   25482篇
  2002年   25073篇
  2001年   41370篇
  2000年   42568篇
  1999年   36284篇
  1998年   9970篇
  1997年   9159篇
  1996年   9087篇
  1995年   8452篇
  1994年   8086篇
  1993年   7586篇
  1992年   28204篇
  1991年   26988篇
  1990年   26411篇
  1989年   25356篇
  1988年   23564篇
  1987年   23183篇
  1986年   22252篇
  1985年   21156篇
  1984年   15808篇
  1983年   13483篇
  1982年   8089篇
  1979年   14594篇
  1978年   10211篇
  1977年   8629篇
  1976年   8153篇
  1975年   8961篇
  1974年   10698篇
  1973年   10182篇
  1972年   9666篇
  1971年   8921篇
  1970年   8586篇
  1969年   8029篇
  1968年   7685篇
  1967年   7087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