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   229159篇
  免费   65801篇
  国内免费   2805篇
耳鼻咽喉   5956篇
儿科学   9243篇
妇产科学   3185篇
基础医学   19733篇
口腔科学   6958篇
临床医学   38013篇
内科学   68167篇
皮肤病学   14124篇
神经病学   26250篇
特种医学   8291篇
外国民族医学   3篇
外科学   53943篇
综合类   1328篇
现状与发展   73篇
一般理论   26篇
预防医学   11147篇
眼科学   4752篇
药学   7414篇
  7篇
中国医学   1359篇
肿瘤学   17793篇
  2024年   703篇
  2023年   4937篇
  2022年   1541篇
  2021年   4785篇
  2020年   11314篇
  2019年   13208篇
  2018年   15922篇
  2017年   17213篇
  2016年   18686篇
  2015年   18839篇
  2014年   25874篇
  2013年   26589篇
  2012年   9606篇
  2011年   9725篇
  2010年   18435篇
  2009年   18816篇
  2008年   7998篇
  2007年   5336篇
  2006年   7854篇
  2005年   4867篇
  2004年   4082篇
  2003年   2991篇
  2002年   3124篇
  2001年   4820篇
  2000年   3941篇
  1999年   3686篇
  1998年   3794篇
  1997年   3617篇
  1996年   3491篇
  1995年   3302篇
  1994年   2042篇
  1993年   1653篇
  1992年   1503篇
  1991年   1539篇
  1990年   1163篇
  1989年   1266篇
  1988年   1091篇
  1987年   914篇
  1986年   937篇
  1985年   755篇
  1984年   581篇
  1983年   541篇
  1982年   531篇
  1981年   417篇
  1980年   377篇
  1979年   332篇
  1978年   342篇
  1977年   414篇
  1975年   285篇
  1972年   306篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
Concanavalin A-induced lymphocyte proliferation was studied in 25 patients with alcoholic hepatitis or compensated alcoholic cirrhosis. Nine alcoholics without evidence of liver disease were also evaluated. A nonlinear correlation equation, which was natural logarithmic, was applied to individual dose-response proliferation curves and permitted comparisons between patient groups and controls. The proliferative response in all patient groups was significantly lower when compared to healthy controls and was independent of the presence or absence of liver disease. This suggests that some changes in immune function observed in alcoholics may be linked to the direct effects of alcohol on the immune system rather than to the associated liver disease.  相似文献   
32.
EDITORIAL COMMENT: We accepted this case for publication to remind readers that although uterine rupture during labour in a primigravida is extremely uncommon it does occur, or at any rate nulliparas can develop abdominal pain and shock in labour with a haemoperitoneum resulting from a tear in a vein in the lower posterior uterine wall. When one sees the hugely dilated uterine and ovarian venous plexuses at Caesarean section it is easy to believe that bleeding from such a vessel during labour could be prodigious. This case suggests that a dilated vein with blood flow derangements may be the cause. Nonetheless, as the authors warn us, the necessary response is not a precise diagnosis, but rapid laparotomy. See also Editorial Comment to Chin MMS, Harvey JA, Duffy BL. Uterine rupture during labour in a primigravida. Aust NZ J Obstet Gynaecol 1996; 36: 210.  相似文献   
33.
34.
35.
Summary: This is the first report of the largest study of blood pressure measurement in pregnancy in a New Zealand population using standardized definitions and methodology. Over 3,800 women who delivered in an 8-month period in the Wellington region were included in the study. Blood pressure measurement and the presence of oedema and proteinuria were recorded from booking until delivery and in the puerperium. Only 2.7% of women were unable to be contacted after delivery for details on outcomes. The results established normal ranges for blood pressure throughout pregnancy. The data show that Mood pressure greater than 140/90 until 35 weeks' gestation is outside 2 standard deviations at all gestations and justifies using these measurements as the definition of hypertension in pregnancy. The fall in blood pressure in the 2nd trimester was less than 1 mm Ffg per week in both the systolic and diastolic pressures. This fall was smaller than previously recorded in other studies. Gestational hypertension was the commonest blood pressure abnormality occurring in 15.2% of the population. This represented 69% of the pregnant women with a hypertensive disorder. The overall incidence of both gestational hypertension and preeclampsia was 18.5% which is higher than reported in other parts of the world. In this study obesity was significantly associated with hypertensive disorders in pregnancy. An arm circumference of >33 cm, one of the measurements of obesity, was found in 6.8% of the study population. Even after the effect of arm circumference was taken into account, hypertensive disorders were also more common in Pacific Island women. Ankle oedema was significantly associated with the development of both gestational hypertension and preeclampsia but the incidence of oedema was noted in only 11.9% of the subjects.  相似文献   
36.
The efficacy and safety of ketoprofen and paracetamol were compared for the treatment of acute migraine in a randomized, double-blind study of 64 patients. Thirty-four patients received ketoprofen 100 mg intramuscularly, and 30 patients received paracetamol 500 mg intramuscularly. Partial or complete relief of pain and other symptoms was achieved 15 to 20 minutes after administration in the ketoprofen group and within 35 minutes in the paracetamol group. Complete relief of pain was achieved within 30 to 40 minutes after ketoprofen in 28 patients (82.5%) compared to 5 patients (17.5%) in the paracetamol group. Six of the patients treated with ketoprofen needed a second dose for complete relief of pain during the 4-hour follow-up period. Side effects were rare and minimal. Our findings suggest that ketoprofen produced statistically significant benefit in the treatment of acute migraine.  相似文献   
37.
38.
39.
40.
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