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   58046篇
  免费   3990篇
  国内免费   256篇
耳鼻咽喉   685篇
儿科学   1497篇
妇产科学   1083篇
基础医学   7269篇
口腔科学   956篇
临床医学   5643篇
内科学   11900篇
皮肤病学   730篇
神经病学   5551篇
特种医学   1995篇
外国民族医学   4篇
外科学   9788篇
综合类   826篇
现状与发展   1篇
一般理论   69篇
预防医学   5095篇
眼科学   1188篇
药学   3576篇
中国医学   64篇
肿瘤学   4372篇
  2023年   220篇
  2022年   426篇
  2021年   994篇
  2020年   559篇
  2019年   948篇
  2018年   1161篇
  2017年   798篇
  2016年   898篇
  2015年   998篇
  2014年   1649篇
  2013年   2444篇
  2012年   3582篇
  2011年   3888篇
  2010年   2199篇
  2009年   2038篇
  2008年   3512篇
  2007年   3714篇
  2006年   3668篇
  2005年   3748篇
  2004年   3685篇
  2003年   3364篇
  2002年   3297篇
  2001年   481篇
  2000年   359篇
  1999年   570篇
  1998年   764篇
  1997年   654篇
  1996年   594篇
  1995年   549篇
  1994年   505篇
  1993年   444篇
  1992年   360篇
  1991年   370篇
  1990年   303篇
  1989年   311篇
  1988年   291篇
  1987年   277篇
  1986年   261篇
  1985年   307篇
  1984年   472篇
  1983年   398篇
  1982年   524篇
  1981年   510篇
  1980年   497篇
  1979年   252篇
  1978年   295篇
  1977年   296篇
  1976年   223篇
  1975年   219篇
  1974年   235篇
排序方式: 共有10000条查询结果,搜索用时 11 毫秒
21.
The authors report a new case of abdominal pregnancy with living baby. The analysis of this observation permits to present then the clinical and paraclinical characteristics of this exceptional localization of pregnancy and emphasize the surgical principles involved with its treatment, around the time of the term delivery.  相似文献   
22.
23.
Irritability is often a problem for patients with Post-Traumatic Stress Disorder (PTSD). We describe two cases that illustrate the use of lithium in the treatment of veterans with PTSD who complained of serious problems with irritability or angry outbursts. These cases are discussed in the context of evidence that lithium may be useful in other patients with disorders of impulse control. The evidence linking disorders of anger and impulse control to a dysregulation in neurotransmitter regulation, particularly in serotonergic pathways, supports a psychopharmacologic approach to treatment. These findings should lead to further study of the role of lithium in the treatment of this symptom complex in patients with PTSD.  相似文献   
24.
There are conflicting reports on the relationship between cerebellar vermal lobule hypoplasia and autism. Using quantitative magnetic resonance image analysis, we measured the cerebellar vermis in 125 normal individuals with a broad age range and 102 patients with a variety of neurogenetic abnormalities. We conclude that hypoplasia of cerebellar vermal lobules VI and VII is a nonspecific finding that even occurs in several conditions without autistic behavior. This suggests that it is not a specific neuroanatomical marker for autism, nor is cerebellar dys- genesis likely to be solely responsible for clinical autistic behaviors.  相似文献   
25.
26.
Between 1954 and 1986 inclusive, 160 children in the North West Region of England were registered with histologically proven lowgrade astrocytomas (grade 1 or 2). Ten died before receiving any treatment, and a further seven died within 28 days of surgery, leaving 143 children whose survival in relation to treatment modality is the subject of this paper. Low-grade astrocytomas are responsive to radiation therapy. This treatment has no clear benefit to offer children with superficial tumours that can be resected completely or nearly so, but significantly improves survival rates when tumours are deep-seated and not amenable to excision.  相似文献   
27.
The results of systemic autonomic nerve function studies in patients with closed-angle glaucoma and ocular hypertension are reviewed. Autonomic neuropathy has been demonstrated in 58% of patients with closed-angle glaucoma and 42% of ocular hypertensive subjects, with significantly increased prevalence in ocular hypertensives with narrow iridocorneal angles. The implications are discussed, with particular reference to the pathogenesis of raised intraocular pressure.  相似文献   
28.
29.
Three saxophone players with upper limb amputations have been successfully rehabilitated to play their musical instruments using skin-conductivity touch control. Each attained a standard of musicianship sufficient to perform the standard repertoire of the instrument in a concert setting. The mechanical and electrical modifications to the saxophone are described, as well as the principles of operation of the skin-conductivity touch control module. The touch control module is commercially available for prosthetists who wish to fit musicians or others with upper extremity amputations who require rapid accurate control of a number of channels of powered prosthetic function.  相似文献   
30.
A cross-sectional survey on respiratory health in swine producers showed that 30% of 301 examined men usually used a dust mask when working inside a barn. They did not differ significantly from dust mask nonusers in respect to respiratory symptoms and lung function. This analysis was undertaken to determine whether the respiratory health of dust mask users was associated with reasons why they had started individual respiratory protection. The subjects were recontacted in order to identify those who started using a mask to deliberately prevent symptoms (42 men) and those who started protection because of pre-existing respiratory symptoms (44 men). Not unexpectedly, betweengroup comparisons of respiratory symptoms and lung function suggest that swine producers who wear dust masks for preventive purposes have better respiratory health than those who wear dust masks because of symptoms or those who do not use individual respiratory protection. The individual reasons for starting dust mask usage should be examined among potential determinants of the outcomes of prospective studies which can then provide more valid assessment of the effect of individual respiratory protection. © 1993 Wiley-Liss, Inc.  相似文献   
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