全文获取类型
收费全文 | 14784篇 |
免费 | 678篇 |
国内免费 | 4970篇 |
专业分类
安全科学 | 1033篇 |
废物处理 | 902篇 |
环保管理 | 1146篇 |
综合类 | 7812篇 |
基础理论 | 2419篇 |
污染及防治 | 5306篇 |
评价与监测 | 620篇 |
社会与环境 | 601篇 |
灾害及防治 | 593篇 |
出版年
2024年 | 14篇 |
2023年 | 239篇 |
2022年 | 745篇 |
2021年 | 635篇 |
2020年 | 449篇 |
2019年 | 445篇 |
2018年 | 524篇 |
2017年 | 662篇 |
2016年 | 679篇 |
2015年 | 762篇 |
2014年 | 1109篇 |
2013年 | 1505篇 |
2012年 | 1209篇 |
2011年 | 1270篇 |
2010年 | 983篇 |
2009年 | 887篇 |
2008年 | 1034篇 |
2007年 | 824篇 |
2006年 | 840篇 |
2005年 | 592篇 |
2004年 | 462篇 |
2003年 | 505篇 |
2002年 | 481篇 |
2001年 | 396篇 |
2000年 | 452篇 |
1999年 | 463篇 |
1998年 | 409篇 |
1997年 | 362篇 |
1996年 | 320篇 |
1995年 | 248篇 |
1994年 | 192篇 |
1993年 | 182篇 |
1992年 | 161篇 |
1991年 | 111篇 |
1990年 | 72篇 |
1989年 | 48篇 |
1988年 | 33篇 |
1987年 | 28篇 |
1986年 | 22篇 |
1985年 | 15篇 |
1984年 | 9篇 |
1983年 | 11篇 |
1982年 | 14篇 |
1981年 | 10篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 2篇 |
1974年 | 2篇 |
1973年 | 3篇 |
1972年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 765 毫秒
21.
22.
Carl W. Chen 《Journal of the American Water Resources Association》2003,39(6):1561-1562
23.
24.
The coastal water of northeast Taiwan island, called 'Yin-Yang Hai' for its distinct yellow colour compared with blue offshore water, was investigated from 1989 to 1990 by the authors. Biological study showed the dominant species of plankton to be Copepoda, Cladocera, planktonic eggs and Diatoma. Dominant species of benthos were young crabs, Amphipoda and Annelida, with Amphipoda usually occurring in heavily polluted areas. Heavy metal data showed that the concentration of copper was high. the copper and iron concentration in algae of the intertidal zone was also high. the concentrations of iron and copper in inshore water were also higher than in offshore water. By comparison of the pH and salinity distribution of this area, we conclude that this coastal water has been polluted by acid waste water from coastal industry. the suspended solids concentration in sea water is high. Flocculation occurring at the boundary of fresh and saline water might be a reason for the distinct yellow colour of the water of this area. Further study is required. 相似文献
25.
Adults of the sea urchin Arachnoides placenta (L.) were induced to spawn, and eggs were fertilized at 28°C in September 1989. After 5 min, eggs were transferred to 28, 31, 34, or 37°C and reared to metamorphosis. Embryos were observed at 20-min intervals during the first 2 h; larvae were observed daily. The cleavage was higher at higher temperatures. Embryos reared at 28°C were still at the 4th cleavage (16-cell stage) after 100 min, while those at 34°C had reached the 5th cleavage (32-cell stage). All embryos reared at 37°C died on the second day. Incidence of abnormality was 20 to 30% at 28 and 31°C, 48% at 34°C, and 77% at 37°C. The 8-arm stage was reached after 4 d at 28°C, 3 d at 31°C and 2 d at 34°C. Larvae displayed decreasing body length and arm length with increasing temperature. Larvae at 31°C have relatively long arms, as a result of a decrease in body length, not because of increased arm length. Incidence of metamorphosis was 43.9±1.7% (mean/plusmn;SD) at 28°C, 24.5±1.9% at 31°C, and 5.3% at 34°C. The size of metamorphosed juveniles was significantly larger at 28°C than at 31 and 34°C. Temperatures of 31°C negatively affect larvae and juveniles of the sand dollar. 相似文献
26.
27.
Zheng Lei Li Dewen Song Shuzheng Wang Hongtu Sui Jinjun 《Environment, Development and Sustainability》2022,24(3):3110-3125
Environment, Development and Sustainability - In order to reveal the distribution and migration law of downwind and upwind coal cutting, total dust (TD) and respirable dust (RD) concentration... 相似文献
28.
Dong Junran Wu Desheng Song Jingxiu Lu Jie 《Environment, Development and Sustainability》2022,24(4):5451-5472
Environment, Development and Sustainability - The ecological compensation mechanism is regarded as the direction for the future management of the ecological environment of the river basin, which... 相似文献
29.
Environment, Development and Sustainability - Ecological welfare performance is a measure of the relationship between input ecological resources and output welfare, and it reflects the sustainable... 相似文献
30.
Feng Jingchun Tang YunQing Xue Song Zhang Ke 《Environment, Development and Sustainability》2022,24(1):138-155
Environment, Development and Sustainability - The PPP mode of rural water environment governance was conducive to attracting social capital for giving full play to the decisive role of the market... 相似文献