全文获取类型
收费全文 | 40275篇 |
免费 | 337篇 |
国内免费 | 276篇 |
专业分类
安全科学 | 886篇 |
废物处理 | 1895篇 |
环保管理 | 5611篇 |
综合类 | 6418篇 |
基础理论 | 10835篇 |
环境理论 | 15篇 |
污染及防治 | 9763篇 |
评价与监测 | 2682篇 |
社会与环境 | 2578篇 |
灾害及防治 | 205篇 |
出版年
2022年 | 203篇 |
2021年 | 253篇 |
2019年 | 236篇 |
2018年 | 1867篇 |
2017年 | 1769篇 |
2016年 | 1775篇 |
2015年 | 620篇 |
2014年 | 725篇 |
2013年 | 2464篇 |
2012年 | 1367篇 |
2011年 | 2534篇 |
2010年 | 1698篇 |
2009年 | 1711篇 |
2008年 | 2157篇 |
2007年 | 2614篇 |
2006年 | 1177篇 |
2005年 | 1037篇 |
2004年 | 982篇 |
2003年 | 1074篇 |
2002年 | 1054篇 |
2001年 | 1129篇 |
2000年 | 838篇 |
1999年 | 514篇 |
1998年 | 391篇 |
1997年 | 345篇 |
1996年 | 424篇 |
1995年 | 431篇 |
1994年 | 430篇 |
1993年 | 382篇 |
1992年 | 360篇 |
1991年 | 350篇 |
1990年 | 389篇 |
1989年 | 360篇 |
1988年 | 336篇 |
1987年 | 315篇 |
1986年 | 285篇 |
1985年 | 302篇 |
1984年 | 318篇 |
1983年 | 323篇 |
1982年 | 312篇 |
1981年 | 314篇 |
1980年 | 268篇 |
1979年 | 287篇 |
1978年 | 237篇 |
1977年 | 207篇 |
1976年 | 206篇 |
1975年 | 191篇 |
1974年 | 196篇 |
1973年 | 202篇 |
1972年 | 203篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
Ten out of the 12 new EU members, used to belong to the so-called “former eastern block”, with a post WWII environmental policy radically different from the tendencies followed in Western Europe. The lack of conservation regulations has resulted in a rather harmful industrialization, regarding natural resources and environmental quality. While air pollution transfer is a phenomenon of transboundary level, there is a particular interest in examining the contribution of the new EU member states to the environmental pressure faced by the older member states and vice versa. The current study utilises the official data for almost 20 years published by the European Monitoring and Evaluation Program concerning the transboundary transfer of NOx and SO2 in order to analyse the situation and discuss the present and future environmental policy regarding air pollution. 相似文献
92.
A. G. W. Hunter M.D. 《黑龙江环境通报》1987,7(6):433-441
Three hundred and fifty-four women who underwent midtrimester genetic amniocentesis were matched for age, parity, indication, and smoking history, with an equivalent number of women who had declined the procedure, for the purpose of comparing the neonatal respiratory status of their offspring. There was no evidence that the infants exposed to genetic amniocentesis were compromised. 相似文献
93.
C. A. Dell'Agnola V. Tomaselli E. Teruzzi B. Tadini A. G. Coran Surgeon-in-Chief 《黑龙江环境通报》1993,13(7):629-632
The impact of prenatal sonographic diagnosis of oesophageal and gastrointestinal obstructions has been analysed over a 10-year period. Three groups of patients were evaluated. The first group consisted of 46 newborns with abnormal prenatal sonogratns, 41 of which were confirmed to have intestinal obstruction postnatally. The second group consisted of 17 neonates with normal prenatal sonograms who had intestinal obstruction postnatally. The third group included 56 newborns who did not undergo a prenatal sonogram but who had intestinal obstruction confirmed at surgery. Polyhydramnios without the appearance of a stomach on ultrasound was diagnostic of pure oesophageal atresia. Polyhydramnios with intestinal dilation was diagnostic of intestinal obstruction. Although surgery was performed earlier in the infants diagnosed prenatally with ultrasound, mortality was no less than in the group that did not undergo a prenatal sonogram, probably because of the high incidence of associated anomalies. 相似文献
94.
Manganese-oxidizing fungi and bacteria 总被引:1,自引:0,他引:1
The Science of Nature - 相似文献
95.
The lessons of history indicate that mismanagement of natural resources and the environment often leads to potentially adverse consequences.The increasing interest in economic development,particularly in the developing countries of the world coupled with increasing population pressures and the globalization of economic activity is placing noticeable stresses on the ultimate sustainability of both human and environmental systems.Sustainable development is not a new concept.It has been an area of concern for different elements of society for some time.Yet efforts to understand the implications of sustainable development have not,until recently,been formalized.We have focused singularly on economic development and environmental quality as if they were mutually exclusive.This paper focuses on the concept of concurrency as both a conceptual framework and practicable method of understanding and implementing the ecology and economy of sustainability. 相似文献
96.
97.
98.
99.
100.