全文获取类型
收费全文 | 30126篇 |
免费 | 259篇 |
国内免费 | 194篇 |
专业分类
安全科学 | 765篇 |
废物处理 | 1122篇 |
环保管理 | 3510篇 |
综合类 | 7839篇 |
基础理论 | 6918篇 |
环境理论 | 16篇 |
污染及防治 | 7339篇 |
评价与监测 | 1636篇 |
社会与环境 | 1286篇 |
灾害及防治 | 148篇 |
出版年
2022年 | 229篇 |
2019年 | 212篇 |
2018年 | 407篇 |
2017年 | 386篇 |
2016年 | 559篇 |
2015年 | 454篇 |
2014年 | 631篇 |
2013年 | 2059篇 |
2012年 | 768篇 |
2011年 | 1106篇 |
2010年 | 928篇 |
2009年 | 1049篇 |
2008年 | 1177篇 |
2007年 | 1160篇 |
2006年 | 1020篇 |
2005年 | 906篇 |
2004年 | 868篇 |
2003年 | 845篇 |
2002年 | 840篇 |
2001年 | 1049篇 |
2000年 | 744篇 |
1999年 | 491篇 |
1998年 | 339篇 |
1997年 | 353篇 |
1996年 | 361篇 |
1995年 | 413篇 |
1994年 | 429篇 |
1993年 | 360篇 |
1992年 | 365篇 |
1991年 | 394篇 |
1990年 | 410篇 |
1989年 | 383篇 |
1988年 | 297篇 |
1987年 | 280篇 |
1986年 | 289篇 |
1985年 | 272篇 |
1984年 | 294篇 |
1983年 | 295篇 |
1982年 | 299篇 |
1981年 | 306篇 |
1980年 | 252篇 |
1979年 | 290篇 |
1978年 | 218篇 |
1977年 | 219篇 |
1976年 | 206篇 |
1974年 | 214篇 |
1973年 | 220篇 |
1967年 | 246篇 |
1966年 | 206篇 |
1965年 | 215篇 |
排序方式: 共有10000条查询结果,搜索用时 343 毫秒
631.
632.
重金属在牡蛎(Crassostrea virginica)中的生物积累及其影响因素的研究 总被引:11,自引:0,他引:11
牡蛎软体,贝壳和沉积物中Cd、Cr、Cu、Fe、Mn、Pb和Zn等重金属元素被同步分析研究,研究结果表明,重金属在牡蛎中的生物积累是牡自身的新陈代谢、重金属元素的地球化学性质和环境诸因素综合影响的结果,其中牡蛎斩生理作用对重金属在软体中的积累产生的影响尤为重要,而贝壳中重金属的积累对来自环境的影响更为敏感。 相似文献
633.
634.
635.
Stratigraphy, lithology and depositional structures of Liassic red limestone-breccias of the Adnet Formation, including the 'Adnet Scheck', were studied at several outcrops of the Northern Calcareous Alps (NCA) south-east of Salzburg. A four-fold lithostratigraphic division is proposed for the Adnet Formation of the Osterhorn Mountains: the hemipelagic Schmiedwirt (Sinemurian) and Kehlbach (Carixian) members are separated from the pelagic Saubach Member (Toarcian) by a layer of amalgamated breccias (Scheck Member, probably Domerian to early Toarcian). Several other breccia beds occur locally from the base of the Kehlbach Member up to the lower Saubach Member. Although the sediments overlying the Scheck Member breccias are of coeval age, the ages of the underlying strata are very different. This can be explained by submarine Liassic erosion during a period of resedimentation from the middle Carixian until the early Toarcian. At least 10–15?m of partly lithified sediments were eroded by gravity flows. The entire Kehlbach Member and up to two-thirds of the Schmiedwirt Member were removed at Adnet. The breccias originated from submarine debris flows. Repeated flows over a long period and the depositional setting exclude a triggering by sea-level fluctuations. Most probably they arose from tectonically triggered slumps and slides of superficial sediments. The 'Scheck' was initiated on the steep upper slope of the drowned Triassic Adnet reef and flowed to the north-east.The Pliensbachian to early Toarcian period of tectonic activity indicated by the breccias was the most important during the Liassic in the Osterhorn Mountains and other parts of the NCA. From the large-scale regional distribution of the breccias and in accord with published data, a roughly north-east trending strike-slip fault zone is proposed, crossing the NCA south of the Osterhorn block, with a peaking activity during the Pliensbachian to early Toarcian as the cause of the tectonic movements. 相似文献
636.
637.
Maternal serum alpha-fetoprotein (AFP) and beta-human chorionic gonadotropin (βhCG) measurements taken prior to chorionic villus sampling (CVS) in 21 patients who subsequently miscarried were compared with measurements in a control group of 113 patients with uneventful pregnancies. Patients with AFP levels of 10 iu/ml or more prior to the CVS had a 4·3 times greater risk of miscarriage (95 per cent confidence interval 1·3–13·6). AFP levels obtained 1 week after the CVS in the 13 patients with late miscarriages were higher than in the control group (P = 0·06). Patients miscarrying had a greater rise in AFP (P = 0·06) and a greater fall in βhCG levels (P = 0·04) following the CVS procedure, compared with the control subjects. Each 10-unit change in the difference between AFP or βhCG levels prior to and 1 week following the CVS was associated with a significantly increased risk for late miscarriage. Elevated maternal serum AFP levels early in pregnancy and changes in AFP and βhCG levels following CVS may predict an increased risk for subsequent miscarriage. 相似文献
638.
639.
640.