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   404645篇
  免费   27091篇
  国内免费   4685篇
耳鼻咽喉   5335篇
儿科学   8492篇
妇产科学   10338篇
基础医学   55860篇
口腔科学   12320篇
临床医学   33600篇
内科学   81629篇
皮肤病学   8837篇
神经病学   28399篇
特种医学   14785篇
外国民族医学   94篇
外科学   62849篇
综合类   15116篇
现状与发展   8篇
一般理论   66篇
预防医学   19539篇
眼科学   9991篇
药学   33830篇
  37篇
中国医学   4505篇
肿瘤学   30791篇
  2022年   2604篇
  2021年   4311篇
  2020年   3037篇
  2019年   3723篇
  2018年   5561篇
  2017年   4450篇
  2016年   4385篇
  2015年   5274篇
  2014年   7226篇
  2013年   8732篇
  2012年   11970篇
  2011年   12194篇
  2010年   7520篇
  2009年   6951篇
  2008年   10587篇
  2007年   11519篇
  2006年   11284篇
  2005年   10241篇
  2004年   9629篇
  2003年   9542篇
  2002年   9120篇
  2001年   28989篇
  2000年   29263篇
  1999年   24066篇
  1998年   5415篇
  1997年   4554篇
  1996年   4047篇
  1995年   3678篇
  1994年   3259篇
  1993年   2931篇
  1992年   16190篇
  1991年   14920篇
  1990年   14221篇
  1989年   14024篇
  1988年   12629篇
  1987年   12115篇
  1986年   11132篇
  1985年   10348篇
  1984年   6933篇
  1983年   5608篇
  1982年   2723篇
  1979年   5485篇
  1978年   3347篇
  1977年   2971篇
  1975年   2641篇
  1974年   3064篇
  1973年   2865篇
  1972年   2828篇
  1971年   2773篇
  1969年   2543篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
OBJECTIVE: To assess the effect of glucose control on the rate of growth of fetuses in women with pregestational diabetes mellitus (Types 1 and 2). METHODS: All pregestational diabetic women booked at Mater Mothers' Hospital, Brisbane, Australia, between 1 January 1994 and 31 December 2002, were included. Pregnancies with congenital fetal anomalies, multiple pregnancies, and pregnancies terminated prior to 20 weeks' gestation were excluded. Dating scans were performed before 14 weeks' gestation and serial scans were performed at 18, 24, 28, 32 and 36 weeks. Fetal parameters, including biparietal diameter, femur length and abdominal circumference, were recorded. The daily growth rates for biparietal diameter, femur length, and fetal abdominal area were calculated and compared with those in a low-risk (non-diabetic) population. The growth rates in fetuses of women with satisfactory diabetic control (HbA1c < 6.5%) and unsatisfactory control (HbA1c > or = 6.5%) in the three trimesters were compared. RESULTS: A total of 174 diabetic pregnancies were included and a total of 997 ultrasound scans were performed. The growth rates for fetuses of mothers with diabetes mellitus were significantly higher than for those in the low-risk population. The z-scores for biparietal diameter, femur length, and fetal abdominal area were 0.18, 0.59 and 1.44, respectively. Fetuses of diabetic mothers with high HbA1c in the first trimester had significantly greater fetal abdominal area growth rate than those with normal HbA1c (fetal abdominal area z-score of 1.7 vs. 0.75, P = 0.009). Although the fetal abdominal area z-scores in fetuses of diabetic mothers with high HbA1c in the second or third trimesters were also higher than those with normal HbA1c levels, the differences did not reach statistical significance. Maternal obesity did not influence the fetal growth rate. CONCLUSION: The rate of growth of fetuses of diabetic mothers differs from that of the normal population. Growth acceleration persists until the late third trimester. Moreover, periconceptional glucose control appears to have a significant effect on accelerated growth of the fetal abdominal area.  相似文献   
73.
74.
皮瓣展平法在耳廓再造时扩张皮瓣感染中的应用   总被引:1,自引:0,他引:1  
目的探索耳廓再造时扩张皮瓣感染的处理方法。方法分析中国协和医科大学整形外科医院外耳冉造中心2003年1月~2005年12月耳廓再造时耳后扩张皮瓣发生感染,经皮瓣展平法处理,感染控制后进行耳再造的12例(12耳)患者的治疗情况。结果12例(12耳)患者手术顺利,术后恢复好,再造耳效果与无感染者无明显差异。结论皮瓣展平法是耳廓再造时扩张皮瓣感染较理想的处理方法。  相似文献   
75.
目的:评价东部身体-智力-精神(EBMS)群体干预对进行体外受精(IVF)的中国妇女焦虑缓解的作用。设计:随机对照研究。机构:三级辅助生殖机构。受试者:227例接受第1个IVF周期治疗的妇女。干预:干预组(n=69)接受4次EBMS群体咨询,而对照组(n=115)无任何干预。主要观察指标:状态-特质焦虑问卷。结果:与对照组相比,干预组在干预后状态焦虑平均分显著下降。每组移植同样数目的卵子,但干预组没有明显更高妊娠率的倾向。  相似文献   
76.
目的 探讨Lugol液染色对食管早期癌和癌前病变的诊断价值。方法 对45例食管黏膜可疑病变经内镜以2%Lugol液喷洒染色,观察黏膜染色情况,并取活检送病理组织学检查。结果 45例食管病变染色后,39例呈浅染色或不染色,其中食管癌8例(食管早期癌5例,进展期癌3例),Barrett食管5例,轻至中度不典型增生1l例。本组Lugol液染色对食管早期癌和癌前病变的检出率达46.7%。结论 内镜下应用Lugol液染色结合活检有助于食管早期癌和癌前病变的诊断,且操作简便,具有重要的临床价值。  相似文献   
77.
78.
79.
French asthma patients may be supervised by general practitioners (GPs) and/or specialists. Therefore, this study examined asthma management in patients exclusively supervised by specialists (SPE), GPs, (GP) and both (GP+SPE group), and compared the findings. Asthma patients were consecutively recruited in 348 pharmacies. Each patient completed a questionnaire providing data on personal characteristics, asthma management, perception of disease and asthma supervision. Asthma control was measured using the Asthma Control Test. Questionnaires were linked to computerised records of medications which had been dispensed before inclusion in the study. From the 1,256 patients (mean age = 36.1 yrs, 54.3% females), 11.4, 36.6, and 52.0% were placed in the SPE, GP, and GP+SPE groups, respectively. During the previous 4 weeks, most patients in the SPE group were properly controlled (52.2 versus 26.4 and 21.5% in GP and GP+SPE groups, respectively). The SPE group made more use of fixed combinations of long-acting beta agonist and inhaled corticosteroid, while receiving less short-acting beta agonists, antitussives and antibiotics. Striking differences in symptoms and asthma management were observed according to the type of asthma supervision. The current results strongly support the need to improve the management of asthma in primary care, and the coordination of care between general practitioners and specialists.  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