全文获取类型
收费全文 | 3229篇 |
免费 | 206篇 |
国内免费 | 5篇 |
专业分类
林业 | 204篇 |
农学 | 83篇 |
基础科学 | 22篇 |
560篇 | |
综合类 | 720篇 |
农作物 | 79篇 |
水产渔业 | 262篇 |
畜牧兽医 | 1171篇 |
园艺 | 99篇 |
植物保护 | 240篇 |
出版年
2024年 | 7篇 |
2023年 | 20篇 |
2022年 | 30篇 |
2021年 | 76篇 |
2020年 | 83篇 |
2019年 | 92篇 |
2018年 | 84篇 |
2017年 | 87篇 |
2016年 | 92篇 |
2015年 | 73篇 |
2014年 | 80篇 |
2013年 | 132篇 |
2012年 | 197篇 |
2011年 | 230篇 |
2010年 | 155篇 |
2009年 | 106篇 |
2008年 | 232篇 |
2007年 | 228篇 |
2006年 | 205篇 |
2005年 | 197篇 |
2004年 | 204篇 |
2003年 | 200篇 |
2002年 | 180篇 |
2001年 | 42篇 |
2000年 | 34篇 |
1999年 | 34篇 |
1998年 | 20篇 |
1997年 | 13篇 |
1996年 | 18篇 |
1995年 | 15篇 |
1994年 | 13篇 |
1993年 | 11篇 |
1992年 | 10篇 |
1991年 | 18篇 |
1990年 | 10篇 |
1989年 | 13篇 |
1988年 | 8篇 |
1987年 | 14篇 |
1986年 | 12篇 |
1985年 | 15篇 |
1984年 | 12篇 |
1983年 | 8篇 |
1982年 | 8篇 |
1980年 | 7篇 |
1977年 | 8篇 |
1976年 | 7篇 |
1974年 | 16篇 |
1973年 | 7篇 |
1971年 | 7篇 |
1968年 | 6篇 |
排序方式: 共有3440条查询结果,搜索用时 46 毫秒
21.
22.
23.
24.
Development and characterization of a technique for percutaneous radiologic gastrojejunostomy tube placement in the dog 下载免费PDF全文
25.
Five cases of canine keratomycosis were diagnosed and treated at a private Veterinary Ophthalmology Practice in Melbourne, Australia. Clinical presentations varied between dogs. Predisposing factors were identified in 4 of 5 cases. Diagnostic modalities utilized were corneal cytology and fungal culture. Corneal cytology confirmed the presence of fungal organisms in all five cases. Aspergillus, Scedosporium, and Candida were cultured from three cases, respectively. Specific antifungal treatment included 1% voriconazole solution or 1% itraconazole ointment. Keratectomy and conjunctival grafting surgery was performed in two patients. Resolution of infection and preservation of vision were achieved in 4 of 5 patients. 相似文献
26.
Tamara M. Cohen Shauna Blois Andrew R. Vince 《The Canadian veterinary journal. La revue veterinaire canadienne》2016,57(5):483-486
A 22-month-old indoor/outdoor neutered male domestic short-haired cat had a history of progressive lethargy, vomiting, and decreased appetite. Abdominal ultrasound revealed an irregular hyperechoic mass in the mid-abdomen. He was unresponsive to symptomatic medical management and was euthanized after 3 days of hospitalization. A diagnosis of disseminated extraintestinal toxoplasmosis was made based on the finding of intracytoplasmic protozoan parasites on histopathological examination of mesenteric lymph nodes, hepatic and intestinal samples, and on immunohistochemistry. 相似文献
27.
28.
Initial analytic quality assessment and method comparison of an immunoassay for adrenocorticotropic hormone measurement in equine samples 下载免费PDF全文
29.
Jennifer Stewart Andrew Holloway Roberta Rasotto Kelly Bowlt 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》2016,45(1):179-183
A 10‐year‐old, female spayed Shih Tzu was presented due to weight loss, increased respiratory effort and lethargy, determined to be secondary to a congenital para‐esophageal diaphragmatic defect with partial herniation of the stomach and spleen. Four days following reduction surgery of the displaced abdominal organs thoracic effusion developed. Thoracic fluid evaluation revealed a cell‐rich, protein‐poor modified transudate with neutrophils, reactive mesothelial cells, and atypical epitheloid cells which occasionally appeared to be keratinizing, consistent with neoplastic exfoliation. Thoracic effusion recurred 2 days later, with similar characteristics as the initial sample. Computed tomography (CT) indicated consolidation and displacement of the right middle and accessory lung lobes. Exploratory thoracic surgery demonstrated a thickened, hyperemic right middle lung lobe, and thickened pericardial diaphragmatic ligament. Histologic evaluation of these tissues identified a primary pulmonary adenosquamous carcinoma with intravascular and pleural invasion. Based on these cytologic, histologic, and clinical findings, we conclude that primary pulmonary carcinomas may involve superficial thoracic structures and exfoliate into a thoracic effusion. 相似文献
30.
Xenotransfusion of anemic cats with blood compatibility issues: pre‐ and posttransfusion laboratory diagnostic and crossmatching studies 下载免费PDF全文