全文获取类型
收费全文 | 18674篇 |
免费 | 868篇 |
国内免费 | 5894篇 |
专业分类
安全科学 | 1305篇 |
废物处理 | 1136篇 |
环保管理 | 1592篇 |
综合类 | 9721篇 |
基础理论 | 3510篇 |
污染及防治 | 5804篇 |
评价与监测 | 926篇 |
社会与环境 | 766篇 |
灾害及防治 | 676篇 |
出版年
2024年 | 29篇 |
2023年 | 272篇 |
2022年 | 787篇 |
2021年 | 744篇 |
2020年 | 577篇 |
2019年 | 501篇 |
2018年 | 752篇 |
2017年 | 860篇 |
2016年 | 1025篇 |
2015年 | 1088篇 |
2014年 | 1295篇 |
2013年 | 1630篇 |
2012年 | 1793篇 |
2011年 | 1605篇 |
2010年 | 1183篇 |
2009年 | 1169篇 |
2008年 | 1272篇 |
2007年 | 1076篇 |
2006年 | 1074篇 |
2005年 | 1035篇 |
2004年 | 1006篇 |
2003年 | 942篇 |
2002年 | 529篇 |
2001年 | 393篇 |
2000年 | 458篇 |
1999年 | 412篇 |
1998年 | 307篇 |
1997年 | 340篇 |
1996年 | 289篇 |
1995年 | 232篇 |
1994年 | 175篇 |
1993年 | 142篇 |
1992年 | 133篇 |
1991年 | 80篇 |
1990年 | 72篇 |
1989年 | 31篇 |
1988年 | 29篇 |
1987年 | 21篇 |
1986年 | 15篇 |
1985年 | 9篇 |
1984年 | 7篇 |
1983年 | 8篇 |
1982年 | 13篇 |
1981年 | 8篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1972年 | 2篇 |
1966年 | 2篇 |
1958年 | 1篇 |
1957年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
周丽 《中国环境管理干部学院学报》2005,15(4):86-87,106
针对电石渣浆处理的工艺流程和资源化途径进行了效益分析,工程实践表明:电石渣浆处理后,浆水回用作为生产用水,降低了乙炔生产成本.同时彻底解决电石渣含水率高的问题,利于企业开展资源化,值得在乙炔行业推广. 相似文献
52.
湛江南珠产业振兴战略 总被引:1,自引:1,他引:1
在我国珍珠产业中,南珠具有举足轻重的地位.在分析湛江南珠产业取得成绩的基础上,详细论述了目前存在的密集养殖、种苗退化、场地老化、产品质量下降、加工技术落后、经济效益低等问题,进一步提出了振兴湛江南珠产业的战略对策. 相似文献
53.
美国环保超级基金制度及其实施 总被引:2,自引:0,他引:2
对美国环保超级基金制度的概念和内容作了简要的介绍,并指出了其实施过程中的成功与不足,以期为我国环境法制的完善提供有益的借鉴。 相似文献
54.
Public Perception of Flood Hazard in the Niger Delta,Nigeria 总被引:3,自引:0,他引:3
Summary Our study had the aim of understanding how floodplain dwellers regard the risk of flooding. About 500 questionnaires were
administered to landowners in the selected settlements in the study area using systematic random sampling. The results of
analysis show, among other things, that the population regards most important the causes of floods as heavy, prolonged rainfall
and river overflow. Nevertheless, they have little knowledge of the frequency of severe floods, and flood alleviation schemes.
Most flood victims do not get compensation or relief during flood disaster, and the reason why they remain in the study area
is influenced by their occupations, especially fishing, subsistence agriculture, and the presence of crude oil in the region
which has attracted many migrants who cannot afford the high cost of accommodation and are therefore forced to live in vulnerable
areas of the floodplain. Finally, the study concludes that flood control in the region needs the cooperation of government,
community efforts and an enlightenment programmes through environmental education and mass media. 相似文献
55.
A study of a watershed planning process in the Cache River Watershed in southern Illinois revealed that class divisions, based
on property ownership, underlay key conflicts over land use and decision-making relevant to resource use. A class analysis
of the region indicates that the planning process served to endorse and solidify the locally-dominant theory that landownership
confers the right to govern. This obscured the class differences between large full-time farmers and small-holders whose livelihood
depends on non-farm labor. These two groups generally opposed one another regarding wetland drainage. Their common identity
as “property owner” consolidated the power wielded locally by large farmers. It also provided an instrument – the planning
document – for state and federal government agencies to enhance their power and to bring resources to the region. The planning
process simultaneously ameliorated conflicts between government agencies and the large farmers, while enhancing the agencies’
capacity to reclaim wetlands. In this contradictory manner, the plan promoted the environmental aims of many small-holders,
and simultaneously disempowered them as actors in the region’s political economy.
An erratum to this article is available at . 相似文献
56.
57.
58.
Gaverick?Matheny Kai?M.?A.?ChanEmail author 《Journal of Agricultural and Environmental Ethics》2005,18(6):579-594
Few moral arguments have been made against vegetarian diets. One exception is the “Logic of the Larder:” We do animals a favor
by purchasing their meat, eggs, and milk, for if we did not purchase these products, fewer animals would exist. This argument
fails because many farm animals have lives that are probably not worth living, while others prevent a significant number of
wild animals from existing. Even if this were not so, the purchase of animal products uses resources that could otherwise
be used to bring a much greater number of animals into existence. 相似文献
59.
60.