全文获取类型
收费全文 | 81909篇 |
免费 | 5046篇 |
国内免费 | 770篇 |
专业分类
林业 | 3139篇 |
农学 | 2489篇 |
基础科学 | 674篇 |
9786篇 | |
综合类 | 16380篇 |
农作物 | 3019篇 |
水产渔业 | 3739篇 |
畜牧兽医 | 42467篇 |
园艺 | 1121篇 |
植物保护 | 4911篇 |
出版年
2021年 | 718篇 |
2020年 | 797篇 |
2019年 | 977篇 |
2018年 | 1345篇 |
2017年 | 1551篇 |
2016年 | 1376篇 |
2015年 | 1320篇 |
2014年 | 1495篇 |
2013年 | 2896篇 |
2012年 | 2854篇 |
2011年 | 3448篇 |
2010年 | 2277篇 |
2009年 | 2162篇 |
2008年 | 3070篇 |
2007年 | 2948篇 |
2006年 | 2653篇 |
2005年 | 2574篇 |
2004年 | 2297篇 |
2003年 | 2350篇 |
2002年 | 2201篇 |
2001年 | 2484篇 |
2000年 | 2528篇 |
1999年 | 1939篇 |
1998年 | 789篇 |
1997年 | 705篇 |
1995年 | 740篇 |
1993年 | 664篇 |
1992年 | 1526篇 |
1991年 | 1716篇 |
1990年 | 1640篇 |
1989年 | 1588篇 |
1988年 | 1472篇 |
1987年 | 1526篇 |
1986年 | 1572篇 |
1985年 | 1396篇 |
1984年 | 1187篇 |
1983年 | 1015篇 |
1982年 | 679篇 |
1979年 | 1055篇 |
1978年 | 829篇 |
1977年 | 672篇 |
1976年 | 711篇 |
1975年 | 746篇 |
1974年 | 1004篇 |
1973年 | 984篇 |
1972年 | 951篇 |
1971年 | 878篇 |
1970年 | 851篇 |
1969年 | 804篇 |
1967年 | 701篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
111.
Sources of stray electrical leakage from Power Supply Authority alternating current (AC), fence energiser pulses and randomly generated pulses and spikes on 55 dairy farms in the Waikato area were identified between December 1986 and March 1988. The electrical measurements were made using a specifically designed voltmeter able to detect voltages between 0.1V and 1500V, from single voltage spikes of two microseconds or greater duration from direct current (DC) as well as 50 Hz AC. Ninety-five sources of stray voltage were identified, and 53 per cent of properties had more than one source of >0.5V. The major source was from electric fence energisers. Rotary platform parlours were among the commonest sources of random or transient voltage spikes. Leakage of AC into one or other of the components of the milk transport system such as vat, plate cooler, milk lift pump and milk line was common. Owners acknowledged the improvements in milk production, reproductive performance and growth rate of calves after reduction of the exposure of dairy cattle to stray electrical leakage. A representative summary of five case records helps define the range of improvements that may possibly be achieved. 相似文献
112.
Piper EL 《New Zealand veterinary journal》1989,37(4):173-174
113.
114.
115.
Lichter RL 《Science (New York, N.Y.)》1996,274(5287):483b-484b
116.
Wilson JA Heath AC Stringfellow L Haack NA Clark AG 《New Zealand veterinary journal》1996,44(5):185-187
Four groups of five Romney lambs were treated by plunge dipping with one of four registered organophosphorus flystrike preventatives. Untreated lambs acted as controls. The sheep were challenged at weekly intervals with larval implants of organophosphate-susceptible and -resistant strains of Lucilia cuprina. All four treatments provided 19-21 weeks protection against susceptible larvae but chlorfenvinphos provided the longest protection (16-17 weeks), followed by propetamphos (15-16 weeks), dichlofenthion (10-13 weeks) and diazinon (9-13 weeks), against the resistant strain. 相似文献
117.
118.
119.
1. Variations in the concentration of plasma cholesterol available to the developing oocyte over a three week period in Gallus domesticus are described.
2. There are small changes in concentration between weeks for individual birds, but no changes between consecutive days within weeks or times within days.
3. It is recommended that future attempts to assess the relationship between variation in blood and yolk cholesterol concentrations estimate blood cholesterol concentration from two samples taken a week apart. 相似文献
120.
Meadows RL MacWilliams PS 《Veterinary clinical pathology / American Society for Veterinary Clinical Pathology》1994,23(2):54-62
Varying terms and criteria have been used in the veterinary literature to characterize milky opaque pleural effusions through the years. This article addresses ideas widely repeated in the veterinary and human literature upon which time, experience, diagnostic techniques, experimental data, and improved understanding of pathogenesis have cast doubt. Topics discussed include terminology, pathogenesis of chylous and pseudochylous effusions, criteria for differentiation of chylous from pseudochylous effusions, and clinicopathologic changes associated with drainage of chylous effusions. 相似文献