全文获取类型
收费全文 | 4885篇 |
免费 | 273篇 |
国内免费 | 67篇 |
专业分类
林业 | 316篇 |
农学 | 280篇 |
基础科学 | 421篇 |
233篇 | |
综合类 | 3421篇 |
农作物 | 48篇 |
水产渔业 | 34篇 |
畜牧兽医 | 409篇 |
园艺 | 20篇 |
植物保护 | 43篇 |
出版年
2024年 | 22篇 |
2023年 | 53篇 |
2022年 | 87篇 |
2021年 | 137篇 |
2020年 | 129篇 |
2019年 | 150篇 |
2018年 | 49篇 |
2017年 | 55篇 |
2016年 | 157篇 |
2015年 | 129篇 |
2014年 | 271篇 |
2013年 | 249篇 |
2012年 | 409篇 |
2011年 | 484篇 |
2010年 | 334篇 |
2009年 | 361篇 |
2008年 | 335篇 |
2007年 | 343篇 |
2006年 | 268篇 |
2005年 | 276篇 |
2004年 | 179篇 |
2003年 | 153篇 |
2002年 | 137篇 |
2001年 | 133篇 |
2000年 | 95篇 |
1999年 | 26篇 |
1998年 | 44篇 |
1997年 | 33篇 |
1996年 | 26篇 |
1995年 | 18篇 |
1994年 | 11篇 |
1993年 | 14篇 |
1992年 | 17篇 |
1991年 | 8篇 |
1990年 | 6篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 4篇 |
1986年 | 6篇 |
1982年 | 2篇 |
1980年 | 3篇 |
1978年 | 3篇 |
1977年 | 1篇 |
排序方式: 共有5225条查询结果,搜索用时 0 毫秒
71.
当前,职业生涯规划教育越来越受到高职院校的重视,在全民创业、万众创新的时代,更需要系统考虑职业生涯规划教育的开展与落实,使学生认识到职业生涯规划教育的重要意义。 相似文献
72.
在前人研究的基础上,总结了上一轮土地利用规划实施过程中存在的问题,研究规划衔接的重要性和必要性。从剖析比较各类规划,特别是土地利用总体规划和城乡规划的内容和侧重点差异性的基础上,提出规划衔接的可行性及方法,探讨了规划衔接与建设用地空间管制的主要内容及协调对策,提出了对相关研究和新一轮规划编制的建议。 相似文献
73.
介绍了当前我国基层公共图书馆的发展状况,提出了构建基于总分馆制的县—乡(村)图书馆服务网络的构思,并对构建服务网络中的一些问题给出自己的思考。 相似文献
74.
华洪军 《吉林农业科技学院学报》2013,(3):91-92,121
“概论”课理论性、现实性很强,在当前我国社会转型和改革攻坚深刻影响人们思想的形势下,如何讲好“概论”课对教师的教学理念、教学方法、技能和知识结构都提出了很高的要求.笔者在认真分析学生对思想政治理论课需求的基础上进行了一系列教学方法改革和实践:坚持理论联系实际,讲好讲活理论;采取互动教学方法,让学生更多的参与教学;灵活运用多媒体技术;通过实践教学促进课堂教学;举办多种专题讲座,拓展学生思维和视野. 相似文献
75.
《Veterinary anaesthesia and analgesia》2021,48(6):922-929
ObjectiveTo analyse avian anaesthesia-related mortality in a UK zoological collection over a 5-year period and identify risk factors for mortality.Study designRetrospective cohort study.AnimalsA total of 135 individual birds across 37 species, anaesthetized during 206 events in a UK zoological collection between 1 January 2014 and 30 June 2019 (inclusive).MethodsAnaesthesia records were reviewed and variables such as age, body condition, weight, sex, duration of anaesthesia and health status were collated. Anaesthesia-related mortality was defined as those deaths occurring during anaesthesia and up to 7 days postanaesthesia. Outcome was analysed using multivariable conditional logistic regression. Overall mortality was defined and included birds euthanised during anaesthesia for non-anaesthesia related reasons. Data were summarised as median (range). A value of p < 0.05 was considered significant. Relative risks and 95% confidence intervals (95% CI) were calculated for the association between risk factors and anaesthetic death where a statistically significant difference was found.ResultsThe overall mortality rate was 10.19% (95% CI = 6.06–14.3%), while anaesthesia-related mortality was 3.88% (95% CI = 1.69–7.51%). Birds with an abnormal health status had a 15.53-fold (95% CI = 1.95–123.63) increased risk of death compared with those with a normal health status. The duration of anaesthesia was also a statistically significant risk factor (p = 0.021) in the univariable analysis, but not when combined with health status. No other variables were associated with anaesthesia-related mortality.Conclusions and clinical relevanceAbnormal health status and longer anaesthetic procedures were associated with a significantly increased risk of anaesthesia-related death in this population of birds. It is recommended that anaesthetic duration is minimized, and pre-existing diseases are diagnosed where possible prior to general anaesthesia of birds. Anaesthetizing healthy birds was associated with a low risk of mortality. 相似文献
76.
品性教育与人的全面发展 总被引:1,自引:1,他引:0
张敏 《信阳农业高等专科学校学报》2007,17(1):47-49
“品性”即道德,品性教育既是个人要求,也是社会责任,其目的在于促进人的全面发展。社会主义的品性教育应在吸收古今中外优秀的品性教育的经验基础上,坚持以马克思主义的人的全面发展观为指导,明确品性教育在人的全面发展中的地位与作用,努力探索一条有中国特色的社会主义品性教育之路。 相似文献
77.
Heath TJ 《Australian veterinary journal》2007,85(7):296-299
OBJECTIVE: To compare the career paths of veterinarians who had grown up on farms with animals with those of veterinarians from other backgrounds, during the first 15 years after they graduated. PROCEDURE: Questionnaires were completed by veterinary students in their first and fifth year, and after 1, 5, 10 and 15 years after they graduated. The most recent questionnaires were returned by 134 of 137 graduates, 20% of whom had grown up, or lived for at least two years, on farms where animals were a primary source of income. This paper includes findings from that questionnaire but also contains comparisons with previous ones. RESULTS: Fifteen years after they graduated, veterinarians who had grown up on farms with animals were more likely than those of other backgrounds to be living in centres with < 10,000 people (58% farm, 20% other), irrespective of the type of work they were doing. Although they were more likely to be doing no veterinary work (42% farm, 21% other), they were also more likely to be working in mixed practice (15% farm, 9% other) and with cattle and sheep generally (11% full time equivalent farm, 5% full time equivalent other). However, > 80% of those who had started their careers in mixed practice were no longer in mixed practice after 15 years. Veterinarians of farm origin who were in private practice were more likely to be sole or part owners (93% farm, 46% other) and less likely to be employees (7% farm, 54% other). CONCLUSIONS: In this study, veterinarians who had grown up on farms with animals seemed slightly more likely than those from other backgrounds to continue working in mixed practice and to work with cattle or sheep, although the numbers were small and the differences not significant. Whatever their background, the majority who started their careers in mixed practice left over the next few years, and by 15 years only 15% remained. 相似文献
78.
DUAN Shao guang 《保鲜与加工》2002,(1):109-112
Professor Venzo de Sabbata,working at World Laboratory,Lausanne,Switzerland,and Department of Physics,University of Bologna and Ferrara,Italy,is a famous Italy Physicist in the world.He is engaged with a series of creating research works about gravity quantization of General Relativity Theory in the real space-time which attract the attentions of the world.This paper pays the attention to introduce the works of this field,containing mainly:1.quantizing the general relativity theory in the sense of Einstem-Cartan theory,i.e., general relativity adds the torsion,which means introducing spin into the theory of gravity.2. building a compact mathematical tool for research of gravity quantization,the geometric algebra in the real space-time--multivector algebra,i.e.,developing a spinor manifold in the real space-time. 相似文献
79.
In this paper, the historical reasons of formation of the village inside the city are analyzed. It is indicated that such situation for the villages inside the city are the result of joint action of both the villagers and the government. The foundation of villages inside the city laid on the simple compensation for farmers in confiscating the rural land and lack of intelligence aids. In this paper, the ideas and measures for their reconstruction are put forward based on consideration of the reasons of their formation and difficulties in the reconstruction. 相似文献
80.
The two methods of estimating parameter in computable general equilibrium(CGE) model are introduced and compared:the calibration procedure and econometric estimation. The conclusions are:the estimation of parameter in CGE model must use the calibration procedure coupled with the econometric estimation method;the elasticity of output with respect to labor input,the marginal expenditure share for households and price elasticity of export demand are estimated by econometric estimation method;and other parameters of the CGE model can be get by calibration procedure. 相似文献