全文获取类型
收费全文 | 1659篇 |
免费 | 2篇 |
专业分类
化学工业 | 48篇 |
金属工艺 | 45篇 |
机械仪表 | 14篇 |
建筑科学 | 2篇 |
矿业工程 | 7篇 |
能源动力 | 10篇 |
轻工业 | 5篇 |
水利工程 | 13篇 |
石油天然气 | 46篇 |
无线电 | 19篇 |
一般工业技术 | 125篇 |
冶金工业 | 1256篇 |
原子能技术 | 24篇 |
自动化技术 | 47篇 |
出版年
2018年 | 7篇 |
2017年 | 6篇 |
2016年 | 16篇 |
2014年 | 10篇 |
2013年 | 16篇 |
2012年 | 13篇 |
2011年 | 13篇 |
2010年 | 20篇 |
2009年 | 21篇 |
2008年 | 15篇 |
2007年 | 9篇 |
2006年 | 12篇 |
2005年 | 9篇 |
2001年 | 7篇 |
2000年 | 5篇 |
1999年 | 6篇 |
1998年 | 283篇 |
1997年 | 210篇 |
1996年 | 173篇 |
1995年 | 95篇 |
1994年 | 78篇 |
1993年 | 63篇 |
1992年 | 16篇 |
1991年 | 21篇 |
1990年 | 9篇 |
1989年 | 18篇 |
1988年 | 11篇 |
1987年 | 7篇 |
1986年 | 11篇 |
1985年 | 8篇 |
1984年 | 11篇 |
1983年 | 7篇 |
1982年 | 18篇 |
1981年 | 15篇 |
1980年 | 26篇 |
1979年 | 13篇 |
1978年 | 15篇 |
1977年 | 84篇 |
1976年 | 135篇 |
1975年 | 10篇 |
1974年 | 7篇 |
1973年 | 11篇 |
1972年 | 10篇 |
1971年 | 15篇 |
1970年 | 14篇 |
1969年 | 8篇 |
1968年 | 8篇 |
1967年 | 6篇 |
1966年 | 8篇 |
1965年 | 7篇 |
排序方式: 共有1661条查询结果,搜索用时 15 毫秒
61.
62.
GIu Sharaevski? LA Tiunov VV Chumakov VS Sukhorukov 《Canadian Metallurgical Quarterly》1996,317(8):66-70, 80
From position of the uniform concept of the accident medicine the problems of toxicological supply of the ships of MNF are considered. Peculiarities of chemical accidents in the ship conditions are marked. The question about principles of harmful chemical substances regulating, forming air environment of ship living quarters is discussed. The prospects of practical use of antidotal means, intended for protection of personnel from toxic action of carbon dioxide and chemical combinations, causing development of toxic edema of lungs are given. 相似文献
63.
64.
FA Amosenko VV Surkov TI Tikhonenko TS Maksimova 《Canadian Metallurgical Quarterly》1976,26(3):361-366
Progressive systemic sclerosis may be associated with focal myocardial fibrosis. Electrocardiographic abnormalities including conduction block are common in progressive systemic sclerosis but whether they are due to direct destruction of the specialized conduction tissue of the heart is uncertain. The conduction systems of 35 patients with progressive systemic sclerosis were studied. Of these 35 patients, 17 (50 per cent) had myocardial fibrosis of the type seen in progressive systemic sclerosis. In 10 of the 17, it was severe. Sinus node fibrosis was present in 13 patients and was nearly as frequent in those with as in those without the progressive systemic sclerosis myocardial lesion. Overlying pericarditis may have contributed to the fibrotic changes within the sinoatrial nodes in seven of the 13 patients. The atrioventricular node and main His bundles were normal. However, fibrotic changes were found in the proximal bundle systems in six patients. In three of the six, severe myocardial progressive systemic sclerosis was present, two had focal fibrous atrophy of the left bundle, and one had complete interruption of the right bundle. In only the latter patient was this reflected in the electrocardiogram which showed a right bundle branch block. Three patients without progressive systemic sclerosis myocardial lesions also had fibrous atrophy of a portion of the proximal left bundle branch, and in one the electrocardiogram showed an isolated left anterior hemiblock. Thus, morphologic abnormalities within the conduction system in our patients are difficult to attribute to progressive systemic sclerosis per se. Furthermore, although conduction abnormalities were more frequent in patients with myocardial disease, specific conduction system disease was not the cause in most patients. As has been noted in ischemic heart disease, the conduction system appears to be relatively spared from the myocardial changes of progressive systemic sclerosis, and the high incidence of conduction disturbances in this condition may be a consequence, rather, of damage to working myocardium. 相似文献
65.
66.
67.
68.
69.
OE Kolesova LM Alekseeva LA Apollonova TM Frolova VV Ivanitskaia 《Canadian Metallurgical Quarterly》1982,45(2):59-62
The increase of the concentration of fatty acids, the reduction in the concentration of serotonin, the lowering of the activity of glucose-6-phosphate dehydrogenase and transketolase, and the development of compensated metabolic acidosis were discovered in the stage that preceded strophanthine arrhythmia. These characteristics may be recommended for a wider use on the clinical basis for predicting arrhythmias in the treatment of cardiac glycosides. 相似文献
70.
II Gitel'zon VP Nefedov VV Mezhevikin VA Samo?lov IuV Kotlovski? 《Canadian Metallurgical Quarterly》1977,84(7):23-24
Hypoxemia (45-minute) influence in vivo on erythropoietic activity of the kidney, liver, spleen, and sternum was studied by normoxemic perfusion of the isolated organs. The erythropoietic activity proved to increase after 6-hour perfusion of the liver; this confirmed the participation of this organ in the extrarenal secretion of the erythropoietic factor. 相似文献