全文获取类型
收费全文 | 11420篇 |
免费 | 3643篇 |
国内免费 | 4篇 |
专业分类
林业 | 429篇 |
农学 | 650篇 |
基础科学 | 10篇 |
2276篇 | |
综合类 | 622篇 |
农作物 | 708篇 |
水产渔业 | 2825篇 |
畜牧兽医 | 5929篇 |
园艺 | 78篇 |
植物保护 | 1540篇 |
出版年
2023年 | 31篇 |
2022年 | 73篇 |
2021年 | 241篇 |
2020年 | 549篇 |
2019年 | 1093篇 |
2018年 | 1013篇 |
2017年 | 1053篇 |
2016年 | 1077篇 |
2015年 | 941篇 |
2014年 | 967篇 |
2013年 | 1225篇 |
2012年 | 798篇 |
2011年 | 881篇 |
2010年 | 801篇 |
2009年 | 456篇 |
2008年 | 532篇 |
2007年 | 373篇 |
2006年 | 372篇 |
2005年 | 337篇 |
2004年 | 326篇 |
2003年 | 278篇 |
2002年 | 313篇 |
2001年 | 212篇 |
2000年 | 218篇 |
1999年 | 86篇 |
1998年 | 32篇 |
1997年 | 30篇 |
1996年 | 24篇 |
1995年 | 25篇 |
1994年 | 19篇 |
1993年 | 27篇 |
1992年 | 28篇 |
1991年 | 28篇 |
1990年 | 37篇 |
1989年 | 41篇 |
1988年 | 31篇 |
1987年 | 40篇 |
1986年 | 20篇 |
1985年 | 33篇 |
1984年 | 24篇 |
1983年 | 29篇 |
1981年 | 20篇 |
1978年 | 27篇 |
1977年 | 24篇 |
1976年 | 29篇 |
1975年 | 17篇 |
1974年 | 22篇 |
1973年 | 23篇 |
1972年 | 22篇 |
1970年 | 17篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
Fracture of the medial intercondylar eminence of the tibia in horses treated by arthroscopic fragment removal (21 horses) 下载免费PDF全文
43.
44.
An improved vitrification protocol for equine immature oocytes,resulting in a first live foal 下载免费PDF全文
45.
46.
47.
48.
49.
Questionnaire‐based Analysis of Owner‐reported Scratching and Pain Signs in Cavalier King Charles Spaniels Screened for Chiari‐like Malformation and Syringomyelia 下载免费PDF全文
C.R. Sparks S. Cerda‐Gonzalez E.H. Griffith B.D.X. Lascelles N.J. Olby 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2018,32(1):331-339
Background
Chiari‐like malformation (CM) and syringomyelia (SM) cause a pain syndrome in Cavalier King Charles spaniels (CKCS). Clinical signs are not consistently apparent on neurologic examination, and owner reporting of signs provides vital clinical history. However, owner questionnaires for this disease are not well developed.Objectives
To develop a tool to capture owner‐reported clinical signs for use in clinical trials and to compare owner‐reported signs with the presence of pain on neurologic examination and SM on magnetic resonance imaging (MRI).Animals
Fifty client‐owned CKCS.Methods
Owners completed a questionnaire and pain/scratch map. Each dog underwent a neurologic examination and craniocervical magnetic resonance imaging (MRI). Questionnaire responses were developed into scores, area of shading for pain/scratch maps was measured, and consistency of responses between these tools was assessed. Owner‐reported findings were compared with neurologic examination findings and presence and severity of SM on MRI.Results
Thirty‐three dogs were symptomatic and 17 asymptomatic; 30 had SM. The most common sign of pain was crying out when lifted (n = 11). Extent of shaded areas on maps positively correlated with questionnaire scores for pain (r2 = 0.213, P = 0.006) and scratch (r2 = 0.104, P = 0.089). Owner‐reported findings were not significantly associated with presence or severity of SM or neurologic examination findings. Owner‐reported lateralization of signs was significantly associated with SM lateralization (P < 0.0001).Conclusions
The questionnaire and maps may be useful for clinical trials. Lack of association of owner‐reported signs with SM highlights our lack of understanding of the pathophysiology of pain in this disease. 相似文献50.
Retrospective Evaluation of the Effect of Heart Rate on Survival in Dogs with Atrial Fibrillation 下载免费PDF全文
B. Pedro J. Dukes‐McEwan M.A. Oyama M.S. Kraus A.R. Gelzer 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2018,32(1):86-92