全文获取类型
收费全文 | 50914篇 |
免费 | 2736篇 |
国内免费 | 33篇 |
专业分类
林业 | 2623篇 |
农学 | 1536篇 |
基础科学 | 217篇 |
5743篇 | |
综合类 | 10147篇 |
农作物 | 1949篇 |
水产渔业 | 2346篇 |
畜牧兽医 | 25432篇 |
园艺 | 559篇 |
植物保护 | 3131篇 |
出版年
2019年 | 450篇 |
2018年 | 734篇 |
2017年 | 789篇 |
2016年 | 687篇 |
2015年 | 636篇 |
2014年 | 767篇 |
2013年 | 1758篇 |
2012年 | 1485篇 |
2011年 | 1665篇 |
2010年 | 1074篇 |
2009年 | 1162篇 |
2008年 | 1632篇 |
2007年 | 1645篇 |
2006年 | 1537篇 |
2005年 | 1462篇 |
2004年 | 1377篇 |
2003年 | 1345篇 |
2002年 | 1281篇 |
2001年 | 1529篇 |
2000年 | 1484篇 |
1999年 | 1215篇 |
1998年 | 455篇 |
1997年 | 474篇 |
1996年 | 470篇 |
1995年 | 523篇 |
1994年 | 470篇 |
1993年 | 481篇 |
1992年 | 922篇 |
1991年 | 916篇 |
1990年 | 907篇 |
1989年 | 916篇 |
1988年 | 865篇 |
1987年 | 899篇 |
1986年 | 890篇 |
1985年 | 894篇 |
1984年 | 723篇 |
1983年 | 652篇 |
1979年 | 647篇 |
1978年 | 540篇 |
1977年 | 459篇 |
1976年 | 462篇 |
1975年 | 502篇 |
1974年 | 691篇 |
1973年 | 605篇 |
1972年 | 675篇 |
1971年 | 671篇 |
1970年 | 598篇 |
1969年 | 590篇 |
1968年 | 450篇 |
1967年 | 511篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
Experiments involving the laser vaporization of graphite have indicated that one particular duster of carbon, C(60), is preeminently stable; this special stability may be evidence that C(60) can readily take the form of a hollow truncated icosahedron (a sort of molecular soccerball). If true, this structure for C(60) would be the first example of a spherical aromatic molecule. In fact, because of symmetry properties unique to the number 60, it may be the most perfecty spherical, edgeless molecule possible. Its rapid formation in condensing carbon vapors and its extreme chemical and photophysical stability may have far-reaching implications in a number of areas, particularly combustion science and astrophysics. For these reasons C(60) and other dusters of carbon have continued to be the subject of intense research. This article provides a short review of the many new experimental probes of the properties of C(60) and related carbon dusters. 相似文献
72.
Adetunji A Pascoe PJ McDonell WN Horney FD 《The Canadian veterinary journal. La revue veterinaire canadienne》1984,25(9):342-346
A retrospective morbidity and mortality study was carried out on 125 case records of cattle involving xylazine/halothane anesthesia at the Ontario Veterinary College, Guelph between May 1979 and February 1983. 相似文献
73.
74.
A series of 10 farm trials was conducted in which the lambing performance of ewes immunised against polyandroalbumin was compared with that of untreated ewes in the same flock. The trials show that polyandroalbumin treatment is a reliable method of increasing lambing and tailing percentages in New Zealand flocks. An average of 39 extra lambs born per 100 ewes tupped was achieved on farms where ewes were given two treatments about four weeks apart and rams were introduced 18-26 days after the second dose. On farms where rams were introduced less than 12 days after this booster injection an average of 19 extra lambs born per 100 ewes tupped resulted. On farms where rams were introduced at 18-26 days post booster injection an average of 35 extra lambs were tailed for every 100 ewes tupped. The response for immunization increased in direct relation to the liveweight of the ewes at tupping. 相似文献
75.
76.
Perera FP 《Science (New York, N.Y.)》1986,234(4774):372-373
77.
Curtis RA Viel L McGuirk SM Radostits OM Harris FW 《The Canadian veterinary journal. La revue veterinaire canadienne》1986,27(4):170-172
The purpose of this paper is to emphasize the importance of pulmonary auscultation for the clinician. It suggests a clarification and simplification of the terminology to be used which would be helpful to veterinary students and allow better communications between veterinarians. The interpretation of these sounds and the relationships to conditions and diseases of the lungs in cattle, horses, sheep and goats are discussed. 相似文献
78.
79.
Barlett PF 《Science (New York, N.Y.)》1986,234(4779):1015
80.