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   79774篇
  免费   4054篇
  国内免费   61篇
林业   3783篇
农学   2533篇
基础科学   434篇
  8522篇
综合类   15774篇
农作物   3223篇
水产渔业   3555篇
畜牧兽医   40177篇
园艺   996篇
植物保护   4892篇
  2018年   934篇
  2017年   1008篇
  2016年   915篇
  2015年   828篇
  2014年   1019篇
  2013年   2750篇
  2012年   1813篇
  2011年   2255篇
  2010年   1507篇
  2009年   1425篇
  2008年   2204篇
  2007年   2213篇
  2006年   2028篇
  2005年   1973篇
  2004年   1874篇
  2003年   1886篇
  2002年   1823篇
  2001年   2311篇
  2000年   2301篇
  1999年   1927篇
  1998年   734篇
  1997年   718篇
  1995年   839篇
  1993年   737篇
  1992年   1546篇
  1991年   1608篇
  1990年   1721篇
  1989年   1697篇
  1988年   1555篇
  1987年   1521篇
  1986年   1568篇
  1985年   1561篇
  1984年   1286篇
  1983年   1176篇
  1982年   815篇
  1981年   738篇
  1979年   1281篇
  1978年   1009篇
  1977年   880篇
  1976年   831篇
  1975年   935篇
  1974年   1228篇
  1973年   1260篇
  1972年   1283篇
  1971年   1208篇
  1970年   1122篇
  1969年   1036篇
  1968年   881篇
  1967年   929篇
  1966年   861篇
排序方式: 共有10000条查询结果,搜索用时 343 毫秒
31.
Since the International Society of Veterinary Acupuncture (IVAS) was founded in 1974, acupuncture (AP) has received greater acceptance by veterinary professionals throughout the world. This article introduces some important animal diseases that respond well to AP therapy. These include resuscitation of small animals, treatment of anoestrous gilts and sows, bovine reproductive disease, canine vertebral problems and equine backpain, etc. Conventional medicine considers these to be difficult cases to treat. Veterinarians have become more aware of the benefits of AP especially for those diseases, thanks to the efforts of experienced practitioners and scientists, and the many published reports on veterinary AP that have introduced some good indications for AP therapy in veterinary practice. Possible mechanisms behind the effectiveness of AP are discussed. This article aims to introduce veterinarians to good indications for AP to initiate their interest in the practice of AP. Although this is a rapidly expanding field, a long march must begin with one step. We wish this article to be the shoes for such a march. For more information on veterinary AP, contact IVAS , P.O. Box 1478, Longmont, CO.. 80502, USA (http://www.ivas.org), or your national veterinary acupuncture society (http://www.komvet.at/ ivadkom/vapsocs.htm).  相似文献   
32.
Two serological tests (indirect immunofluorescence and enzyme-linked immunosorbent assay) were developed for the detection of fetal antibody to Chlamydia psittaci. Fetal blood and thoracic fluid from 126 field cases of suspected ovine chlamydial abortion were examined using both tests. Placenta and fetal tissues (lung, liver, and kidney) from the same animals were also examined by the following conventional diagnostic methods: isolation in McCoy cells, detection of chlamydial lipopolysaccharide (LPS), modified Ziehl-Nielsen staining, and direct fluorescent antibody staining of chlamydia in frozen cryostat sections. Seventy cases were positive by fetal serology, and of these, 68 were also positive by isolation and/or LPS detection. The remaining 56 cases had negative fetal serology, and of these, 39 were positive by isolation and/or LPS detection. Results indicate that fetal serology, although less sensitive than either isolation in McCoy cells or detection of chlamydial LPS antigen, may be of particular use when placenta is not available.  相似文献   
33.
34.
Star catalogues     
  相似文献   
35.
36.
37.
38.
The feet of three two-humped camels (Camelus bactrianus), one lama (Lama glama) and four alpacas (Lama pacos) from zoos and a circus in the Netherlands were examined for the mange-mite Choroptes bovis. Mites were found on two of the camels, the lama, and three of the alpacas. On one camel and one alpaca small mange lesions on the feet were present. This is the first report of Chorioptes bovis and chorioptic mange in the two-humped camel.  相似文献   
39.
Ohne Zusammenfassung  相似文献   
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