全文获取类型
收费全文 | 2313篇 |
免费 | 117篇 |
国内免费 | 147篇 |
专业分类
林业 | 301篇 |
农学 | 190篇 |
基础科学 | 137篇 |
196篇 | |
综合类 | 1114篇 |
农作物 | 124篇 |
水产渔业 | 82篇 |
畜牧兽医 | 253篇 |
园艺 | 94篇 |
植物保护 | 86篇 |
出版年
2024年 | 6篇 |
2023年 | 40篇 |
2022年 | 50篇 |
2021年 | 56篇 |
2020年 | 63篇 |
2019年 | 55篇 |
2018年 | 30篇 |
2017年 | 102篇 |
2016年 | 106篇 |
2015年 | 57篇 |
2014年 | 125篇 |
2013年 | 107篇 |
2012年 | 164篇 |
2011年 | 173篇 |
2010年 | 149篇 |
2009年 | 154篇 |
2008年 | 155篇 |
2007年 | 167篇 |
2006年 | 136篇 |
2005年 | 111篇 |
2004年 | 89篇 |
2003年 | 88篇 |
2002年 | 63篇 |
2001年 | 59篇 |
2000年 | 40篇 |
1999年 | 32篇 |
1998年 | 26篇 |
1997年 | 31篇 |
1996年 | 21篇 |
1995年 | 20篇 |
1994年 | 15篇 |
1993年 | 20篇 |
1992年 | 16篇 |
1991年 | 9篇 |
1990年 | 11篇 |
1989年 | 8篇 |
1988年 | 8篇 |
1987年 | 7篇 |
1986年 | 2篇 |
1985年 | 1篇 |
1982年 | 1篇 |
1981年 | 2篇 |
1980年 | 2篇 |
排序方式: 共有2577条查询结果,搜索用时 31 毫秒
21.
This paper summarized the recent research results about the durability of structures, introduced their current application in durability design, appraisal, estimation of rest life and strategy of maintenance and strengthening as well as in other fields. 相似文献
22.
UASB反应器三相分离器的设计方法 总被引:3,自引:0,他引:3
气固液三相分离器是UASB反应器的重要构成部分。本文提出了一整套三相分离器的设计方法,提供了一些设计参数,并且介绍了三相分离器的设计实例。 相似文献
23.
This paper describes a role playing planning exercise that has been used for training agriculturists, engineers and agricultural economists for more than ten years. It sets out the objectives and key features of the exercise and the experience that has been gained in its use. The exercise has been found to successfully test and integrate subject matter expertise acquired from formal teaching. It also highlights the multiple and often conflicting objectives of irrigation planning, and the need for full evaluation of alternatives and sound technical judgements under conditions of inadequate data and time pressure. The exercise is also successful in developing professional personal skills such as group working, interviewing and presentation, and is recommended as an effective training aid. 相似文献
24.
This paper reports on laboratory research on the sediment passagecapability through long-throated flumes and broad-crested weirs withwhich the Froude number in the approach channel does not exceed 0.6over a distance of about 20 times the water depth upstream of thestructure. Design rules are given for any combination of flume or weirin combination with any channel. 相似文献
25.
26.
合同解除制度是合同制度的重要内容。我国《合同法》和《联合国国际货物销售合同公约》对合同解除制度都有比较详细的规定。本文试从合同解除的条件、程序及后果等方面对两者的规定进行比较分析。 相似文献
27.
民事执行和解制度的现状及完善 总被引:1,自引:0,他引:1
我国的法律未能明确执行和解协议所应当具有的法律地位与效力,且在制度上欠缺救济手段,在事实上否认了和解协议的民事协议地位。这主要是由于某些基础理论界定的偏差及现行立法规定的失当。因此,本文从理论上对和解制度加以分析,以期对我国强制执行法的制定提供一点有益的建议。 相似文献
28.
The factors influencing the decision of smallholder farmers to adopt new farming technologies were studied with reference to rubber–tea intercropping in Sri Lanka. Rubber–tea intercropping has been recommended previously to rubber farmers as a means to improve productivity and income during the early pre-tapping phase of rubber growth. Although crop trials have shown that the two crops are agronomically compatible and potentially produce a combined economic yield superior to the yield of a sole crop grown on the same area of land, there is little evidence of widespread adoption of this practice among smallholder farmers in Sri Lanka. The aim of the study was to determine the major factors that influence the decision to undertake rubber–tea intercropping and to construct a predictive model that describes the likelihood of adoption of intercropping by traditional smallholder rubber growers. A rapid rural appraisal (RRA) was undertaken based on semi-structured interviews of 90 smallholder farmers in the main rubber growing low wet zone of Sri Lanka. Among a number of factors shown to significantly influence the decision to intercrop tea with rubber, three were shown to operate independently, namely level of income, source of income (i.e. solely from own farm or from farm plus additional off-farm enterprises), and availability of land considered suitable for tea cultivation. A statistical model developed through correlation and logistic analysis, which predicts the likelihood of a smallholder adopting intercropping based on these factors, is presented and discussed. The most likely combination of circumstances (82% probability) under which rubber–tea intercropping is practiced is shown to be where the farmer’s income is greater than Rs. 10,000 per month, where the farmer’s income is based solely on own farm enterprises, and where more than 80% of the farmer’s land area was judged to be suitable for tea cultivation. Conversely, 30% of smallholder farmers that chose not to intercrop did possess land suitable for tea cultivation. Qualitative responses to the RRA indicated that limitation of technical knowledge was the main problem subsequently faced by rubber farmers who had adopted rubber–tea intercropping. Results indicate that there is need for both income support through farm subsidies and further agricultural extension services, if rubber–tea intercropping is to be adopted more widely in Sri Lanka. The wider usefulness of the developed logistic model in determining the likelihood of adoption of intercropping by smallholder farmers is discussed. 相似文献
29.
30.
近3年来成功地作了20例水牛的脾切除术,没有1例因手术而招致死亡。成功地探索出适合于水牛脾切除术的麻醉方法、切口部位和大小、手术操作方法。 相似文献