全文获取类型
收费全文 | 23569篇 |
免费 | 4034篇 |
国内免费 | 266篇 |
专业分类
耳鼻咽喉 | 923篇 |
儿科学 | 679篇 |
妇产科学 | 518篇 |
基础医学 | 1921篇 |
口腔科学 | 649篇 |
临床医学 | 3268篇 |
内科学 | 5282篇 |
皮肤病学 | 714篇 |
神经病学 | 2231篇 |
特种医学 | 901篇 |
外科学 | 4876篇 |
综合类 | 396篇 |
现状与发展 | 2篇 |
一般理论 | 8篇 |
预防医学 | 2190篇 |
眼科学 | 570篇 |
药学 | 995篇 |
中国医学 | 8篇 |
肿瘤学 | 1738篇 |
出版年
2023年 | 585篇 |
2022年 | 252篇 |
2021年 | 493篇 |
2020年 | 873篇 |
2019年 | 425篇 |
2018年 | 886篇 |
2017年 | 825篇 |
2016年 | 944篇 |
2015年 | 934篇 |
2014年 | 1231篇 |
2013年 | 1480篇 |
2012年 | 929篇 |
2011年 | 864篇 |
2010年 | 953篇 |
2009年 | 1134篇 |
2008年 | 847篇 |
2007年 | 772篇 |
2006年 | 844篇 |
2005年 | 701篇 |
2004年 | 642篇 |
2003年 | 615篇 |
2002年 | 581篇 |
2001年 | 561篇 |
2000年 | 575篇 |
1999年 | 523篇 |
1998年 | 401篇 |
1997年 | 398篇 |
1996年 | 446篇 |
1995年 | 402篇 |
1994年 | 279篇 |
1993年 | 221篇 |
1992年 | 423篇 |
1991年 | 420篇 |
1990年 | 331篇 |
1989年 | 395篇 |
1988年 | 317篇 |
1987年 | 294篇 |
1986年 | 338篇 |
1985年 | 308篇 |
1984年 | 266篇 |
1983年 | 210篇 |
1982年 | 196篇 |
1979年 | 212篇 |
1978年 | 161篇 |
1977年 | 161篇 |
1975年 | 161篇 |
1974年 | 166篇 |
1973年 | 156篇 |
1972年 | 172篇 |
1971年 | 139篇 |
排序方式: 共有10000条查询结果,搜索用时 7 毫秒
51.
The techniques specific to peroperative fluorocholangiography are discussed based on an experience of 632 cholangiograms and an estimation has been made of the associated radiation doses to staff and patients. Rapid and accurate information can be obtained during fluorocholangiography using appropriate techniques with acceptably low radiation hazards. 相似文献
52.
The purpose of this pilot study was to observe both relaxed and deep breathing patterns in a convenience sample to determine the incidence of normal versus faulty patterns of respiration. These observations were then combined with respondent answers to a survey on pain history to determine if there is any correlation between faulty breathing and musculo-skeletal pain patterns. If such a correlation can be made, then we propose that clinicians working with chronic pain patients may have improved outcomes if they address and correct faulty breathing patterns. Based on this study, it is suggested to include the evaluation and treatment of faulty respiration in the rehabilitation of chronic musculo-skeletal conditions, most notably cervical pain. 相似文献
53.
54.
55.
56.
57.
58.
Jocelyn M. Cottrell BS Marjolein C. H. van der Meulen PhD Joseph M. Lane MD Elizabeth R. Myers PhD 《HSS journal》2006,2(1):12-18
The clinical goal of spinal fusion is to reduce motion and the associated pain. Therefore, measuring motion under loading
is critical. The purpose of this study was to validate four-point bending as a means to mechanically evaluate simulated fusions
in dog and rabbit spines. We hypothesized that this method would be more sensitive than manual palpation and would be able
to distinguish unilateral vs bilateral fusion. Spines from four mixed breed dogs and four New Zealand white rabbits were used
to simulate posterolateral fusion with polymethyl methacrylate as the fusion mass. We performed manual palpation and nondestructive
mechanical testing in four-point bending in four planes of motion: flexion, extension, and right and left bending. This testing
protocol was used for each specimen in three fusion modes: intact, unilateral, and bilateral fusion. Under manual palpation,
all intact spines were rated as not fused, and all unilateral and bilateral simulated fusions were rated as fused. In four-point
bending, dog spines were significantly stiffer after unilateral fusion compared with intact in all directions. Additionally,
rabbit spines were stiffer in flexion and left bending after unilateral fusion. All specimens exhibited significant differences
between intact and bilateral fusion except the rabbit in extension. For unilateral vs bilateral fusion, significant differences
were present for right bending in the dog model and for flexion in the rabbit. Unilateral fusion can provide enough stability
to constitute a fused grade by manual palpation but may not provide structural stiffness comparable to bilateral fusion. 相似文献
59.
60.
OBJECTIVE: The role of apical versus basal cochlear implant electrode stimulation on central auditory development was examined. We hypothesized that, in children with early onset deafness, auditory development evoked by basal electrode stimulation would differ from that evoked more apically. METHODS: Responses of the auditory nerve and brainstem, evoked by an apical and a basal implant electrode, were measured over the first year of cochlear implant use in 50 children with early onset severe to profound deafness who used hearing aids prior to implantation. RESULTS: Responses at initial stimulation were of larger amplitude and shorter latency when evoked by the apical electrode. No significant effects of residual hearing or age were found on initial response amplitudes or latencies. With implant use, responses evoked by both electrodes showed decreases in wave and interwave latencies reflecting decreased neural conduction time through the brainstem. Apical versus basal differences persisted with implant experience with one exception; eIII-eV interlatency differences decreased with implant use. CONCLUSIONS: Acute stimulation shows prolongation of basally versus apically evoked auditory nerve and brainstem responses in children with severe to profound deafness. Interwave latencies reflecting neural conduction along the caudal and rostral portions of the brainstem decreased over the first year of implant use. Differences in neural conduction times evoked by apical versus basal electrode stimulation persisted in the caudal but not rostral brainstem. SIGNIFICANCE: Activity-dependent changes of the auditory brainstem occur in response to both apical and basal cochlear implant electrode stimulation. 相似文献