全文获取类型
收费全文 | 2865篇 |
免费 | 3篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 66篇 |
金属工艺 | 9篇 |
机械仪表 | 7篇 |
建筑科学 | 70篇 |
矿业工程 | 3篇 |
能源动力 | 8篇 |
轻工业 | 89篇 |
水利工程 | 5篇 |
石油天然气 | 1篇 |
无线电 | 39篇 |
一般工业技术 | 40篇 |
冶金工业 | 2486篇 |
原子能技术 | 3篇 |
自动化技术 | 39篇 |
出版年
2022年 | 5篇 |
2020年 | 10篇 |
2019年 | 5篇 |
2017年 | 5篇 |
2016年 | 5篇 |
2015年 | 5篇 |
2014年 | 6篇 |
2013年 | 22篇 |
2012年 | 12篇 |
2011年 | 13篇 |
2010年 | 14篇 |
2009年 | 16篇 |
2008年 | 18篇 |
2007年 | 12篇 |
2006年 | 16篇 |
2005年 | 20篇 |
2004年 | 3篇 |
2003年 | 12篇 |
2002年 | 9篇 |
2001年 | 13篇 |
2000年 | 4篇 |
1999年 | 76篇 |
1998年 | 758篇 |
1997年 | 426篇 |
1996年 | 288篇 |
1995年 | 173篇 |
1994年 | 125篇 |
1993年 | 165篇 |
1992年 | 24篇 |
1991年 | 25篇 |
1990年 | 36篇 |
1989年 | 38篇 |
1988年 | 41篇 |
1987年 | 19篇 |
1986年 | 27篇 |
1985年 | 18篇 |
1984年 | 5篇 |
1983年 | 5篇 |
1982年 | 16篇 |
1981年 | 25篇 |
1980年 | 29篇 |
1979年 | 5篇 |
1978年 | 11篇 |
1977年 | 81篇 |
1976年 | 193篇 |
1975年 | 6篇 |
1974年 | 4篇 |
1972年 | 6篇 |
1971年 | 3篇 |
1965年 | 2篇 |
排序方式: 共有2870条查询结果,搜索用时 0 毫秒
991.
992.
993.
994.
995.
HK Dziub AP Chuprykov AS Harnyts'ka VO Protsyk VM Os'kina OI Benes'ko 《Canadian Metallurgical Quarterly》1996,(1-2):146-148
The article presents results of clinical trial of finlepsine-retard. Objectivized parameters characterizing the time course of psychopathologic symptoms were studied in certain concentrations of finlepsine and beta-endrofin in blood serum. Atypical maniac states do not easily respond to therapies but finlepsine-retard gives the modern psychopharmacotherapy a new horizon. 相似文献
996.
997.
There is evidence that sick building syndrome (SBS) is caused, in part, by indoor surface pollution (ISP): contaminants such as dust, fibres and micro-organisms, deposited on or in surfaces in buildings. A study is described which clarifies the relative importance of a number of possible causes of SBS in a single building. The building, which had a high initial prevalence of SBS symptoms, was used in a doubleblind controlled intervention study with weekly symptom questionnaires. The four interventions were: ventilation system cleaning, air filtration, hot-water extraction cleaning of chairs and carpets, plus high grade filter vacuuming and dusting, and dust mite treatment (application of liquid nitrogen). Only the last two interventions brought about a reduction in symptoms. It is concluded that cleaning which effectively reduces ISP can reduce SBS symptoms. This may be related to the presence of dust mites in furnishings. Improved cleaning may entail better cleaning specifications and/or consideration of requirements for cleaning when selecting and positioning office furniture. If ISP and the temporary local pollution levels created by it are a problem, then monitoring of ambient conditions (by instruments or by human assessors) will not adequately represent the conditions to which occupants are exposed 相似文献
998.
999.
Hyaline cartilage was found on microscopy of sections of the extrahepatic biliary tree in two infants with extrahepatic biliary atresia (EHBA). Respiratory epithelium was not present, and the cartilage did not seem to block the bile duct lumen. Hyperbilirubinemia was manifest in one infant on the second postnatal day, but clinical courses were otherwise unremarkable. In neither infant was the ductal plate malformation found on light microscopy of liver biopsy specimens, and in neither infant was visceral topography abnormal. Hyaline cartilage at the porta hepatis appears to be a novel finding in EHBA. Its significance remains to be defined. 相似文献
1000.