全文获取类型
收费全文 | 19804篇 |
免费 | 344篇 |
国内免费 | 344篇 |
专业分类
安全科学 | 721篇 |
废物处理 | 837篇 |
环保管理 | 3319篇 |
综合类 | 3146篇 |
基础理论 | 5041篇 |
环境理论 | 8篇 |
污染及防治 | 5033篇 |
评价与监测 | 1142篇 |
社会与环境 | 1086篇 |
灾害及防治 | 159篇 |
出版年
2022年 | 178篇 |
2021年 | 185篇 |
2020年 | 194篇 |
2019年 | 171篇 |
2018年 | 322篇 |
2017年 | 294篇 |
2016年 | 446篇 |
2015年 | 368篇 |
2014年 | 497篇 |
2013年 | 1673篇 |
2012年 | 705篇 |
2011年 | 1000篇 |
2010年 | 767篇 |
2009年 | 864篇 |
2008年 | 962篇 |
2007年 | 992篇 |
2006年 | 828篇 |
2005年 | 687篇 |
2004年 | 689篇 |
2003年 | 651篇 |
2002年 | 610篇 |
2001年 | 692篇 |
2000年 | 557篇 |
1999年 | 340篇 |
1998年 | 251篇 |
1997年 | 254篇 |
1996年 | 260篇 |
1995年 | 303篇 |
1994年 | 238篇 |
1993年 | 249篇 |
1992年 | 208篇 |
1991年 | 195篇 |
1990年 | 200篇 |
1989年 | 197篇 |
1988年 | 170篇 |
1987年 | 147篇 |
1986年 | 171篇 |
1985年 | 169篇 |
1984年 | 211篇 |
1983年 | 166篇 |
1982年 | 202篇 |
1981年 | 183篇 |
1980年 | 157篇 |
1979年 | 166篇 |
1978年 | 112篇 |
1977年 | 107篇 |
1975年 | 93篇 |
1974年 | 100篇 |
1973年 | 91篇 |
1972年 | 102篇 |
排序方式: 共有10000条查询结果,搜索用时 241 毫秒
261.
262.
I. Shagina H. L. Dadali V. P. Sitnikov V. V. Pugachev N. A. Malygina O. V. Evgrafov 《黑龙江环境通报》1995,15(1):27-34
Ninety-two families with spinal muscular atrophy (SMA) applied for genetic counselling and further prenatal diagnosis. To minimize expenses, only one tightly linked informative marker was determined in the course of preliminary examination, and non-radioactive allele detection was preferably used. Four prenatal diagnoses of SMA type I, four of SMA type II, and one of SMA type III were made. This trial programme shows the considerable requirements, importance, and potential effectiveness of prenatal prediction of SMA in Russia. 相似文献
263.
Frans J. Los MD PhD Diane Van Opstal Martin P. Schol Johannes L. J. Gaillard Helen Brandenburg Ans M. W. Van Den Ouweland Peter A. In 'T Veld 《黑龙江环境通报》1995,15(12):1155-1159
A prenatally detected case of a rare mosaic tetrasomy 12p/trisomy 12p is reported, presenting as the well-known accessory isochromosome 12p and a supernumerary single 12p marker in 17/24 and 6/24 clones of cultured amniotic fluid cells, respectively. The chromosomal nature of both marker chromosomes was investigated in cultured amniotic fluid cells by fluorescent in situ hybridization with various probes: the 12-centromeric probes pa12H8 and D12Z3, a whole chromosome 12 paint, and the chromosome 12p-specific paint M28. DNA analysis revealed a maternal origin of the extra 12p material. After counselling, the parents requested termination of pregnancy. Inspection and autopsy of the fetus revealed many of the dysmorphisms and internal structural abnormalities of the Pallister–Killian syndrome. 相似文献
264.
Yves Dumez Marc Dommergues Marie-Claire Gubler Victor Bunduki Francoise Narcy Martine Lemerrer Laurent Mandelbrot Richard Berkowitz 《黑龙江环境通报》1994,14(2):141-144
A case of Meckel—Gruber syndrome was diagnosed by embryoscopy at 10 menstrual weeks, allowing for early termination of pregnancy. Post-mortem examination confirmed the presence of polydactyly and bilateral cystic lesions of the mesonephros and metanephros. Both the forming nephrons and the collecting ducts were involved in the formation of renal cysts. 相似文献
265.
266.
A Framework for Monitoring and Evaluating Carbon Mitigation by Farm Forestry Projects: Example of a Demonstration Project in Chiapas,Mexico 总被引:1,自引:0,他引:1
De Jong Ben H.J. Tipper Richard Taylor John 《Mitigation and Adaptation Strategies for Global Change》1997,2(2-3):231-246
Mitigation and Adaptation Strategies for Global Change - In Mexico an estimated 4.5 × 106ha are available for farm forestry, while up to 6.1 × 106 ha could be saved from deforestation by... 相似文献
267.
268.
David M. Sherer MD James R. Woods Jr Jacques S. Abramowicz John A. Dipreta Leon A. Metlay Richard Jaffe 《黑龙江环境通报》1993,13(12):1079-1084
Although malignant transformation of fetal cervical teratoma is extremely rare, perinatal morbidity is high and usually related to the size of the tumour, which may compromise fetal swallowing and subsequently lead to upper airway obstruction. We present a case in which mid-trimester serial sonography demonstrated markedly rapid early growth of a lesion of this type between 17 and 19 weeks' gestation indicating the aggressive nature of this tumour, assisting parental decision to terminate the pregnancy. Histopathology confirmed grade 3 immaturity of the lesion. 相似文献
269.
IntroductionFertilizationisessentialforagriculturalproduction ,butunreasonablyapplyingfertilizerscouldresultinseriesofproblemssuchascropqualitydecline,fertilizeruseefficiencydecrease,residualfertilizerspollution groundwaterandriversandnitrogencontented … 相似文献
270.
W. F. Carey A. Poulos P. Sharp P. V. Nelson E. F. Robertson J. L. Hughes A. Gill 《黑龙江环境通报》1994,14(9):813-819
Variability in the level of expression of very long chain fatty acids (VLCFAs) is documented in cultured chorionic villus (CV) cells derived from two fetuses, one at risk for an unusual peroxisomal fatty acid β-oxidation defect, and the other at risk for the X-linked form of adrenoleucodystrophy (ALD). Cells from early subcultures of chorionic cells from both cases gave normal values for VLCFA ratios. The results for the fetus at risk for the β-oxidation defect were interpreted to indicate that the fetus was not affected; however, at birth, the infant was clinically and biochemically affected. In the case of the fetus at risk for X-linked ALD, although VLCFAs were normal in subculture 1, the levels of these fatty acids increased dramatically in subculture 3, suggesting an abnormal fetus. Termination of the pregnancy and subsequent biochemical and morphological follow-up confirmed that the fetus was indeed affected by ALD. 相似文献