全文获取类型
收费全文 | 2473篇 |
免费 | 6篇 |
国内免费 | 1篇 |
专业分类
化学工业 | 15篇 |
金属工艺 | 2篇 |
机械仪表 | 5篇 |
建筑科学 | 11篇 |
能源动力 | 2篇 |
轻工业 | 54篇 |
石油天然气 | 1篇 |
无线电 | 2篇 |
一般工业技术 | 3篇 |
冶金工业 | 2379篇 |
原子能技术 | 1篇 |
自动化技术 | 5篇 |
出版年
2020年 | 3篇 |
2017年 | 5篇 |
2016年 | 2篇 |
2015年 | 2篇 |
2013年 | 8篇 |
2012年 | 2篇 |
2011年 | 3篇 |
2010年 | 9篇 |
2009年 | 4篇 |
2008年 | 2篇 |
2007年 | 4篇 |
2006年 | 6篇 |
2005年 | 3篇 |
2003年 | 7篇 |
2002年 | 1篇 |
2001年 | 2篇 |
2000年 | 2篇 |
1999年 | 68篇 |
1998年 | 722篇 |
1997年 | 398篇 |
1996年 | 274篇 |
1995年 | 168篇 |
1994年 | 114篇 |
1993年 | 159篇 |
1992年 | 17篇 |
1991年 | 19篇 |
1990年 | 32篇 |
1989年 | 28篇 |
1988年 | 32篇 |
1987年 | 14篇 |
1986年 | 20篇 |
1985年 | 14篇 |
1984年 | 2篇 |
1983年 | 4篇 |
1982年 | 11篇 |
1981年 | 17篇 |
1980年 | 26篇 |
1979年 | 2篇 |
1978年 | 9篇 |
1977年 | 77篇 |
1976年 | 179篇 |
1975年 | 3篇 |
1974年 | 1篇 |
1968年 | 1篇 |
1965年 | 2篇 |
1962年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有2480条查询结果,搜索用时 15 毫秒
11.
The nature of disturbed thinking is explained from two different psychological perspectives and six major types of thought disorder are presented, classified, and discussed. The overlap between these different types of thought disturbance and some possible functions of disturbed thinking are outlined. A heuristic model for detecting thought disorder is presented; and, in addition, some complex conceptual and research issues involved with investigating and systematizing knowledge about disturbed thinking are explained. 相似文献
12.
13.
14.
15.
16.
SD Taptykova NE Cherni AS Tikhonenko LV Kalakutski? 《Canadian Metallurgical Quarterly》1976,21(7):587-591
Jejunal lamina propria plasma cells and eosinophils and intraepithelial lymphocytes were raised in coeliac children on gluten-containing diets, but only intraepithelial lymphocytes were increased in patients on gluten-free diets. In contrast, lamina propria lymphocytes were reduced in children with coeliad disease on gluten-containing diets but were normal in paitents on gluten-free diets. In children with coeliac disease who were studied serially, lamina propria plasma cells and eosinophils and intraepithelial lymphocytes increased, and lamina propria lymphocytes decreased, within three months of the reintroduction of gluten to the diet. These observations are essentially similar to those made in the adult form of the disease and suggest that more than one type of immunological reaction is involved in the pathogenesis of the jejunal lesion. 相似文献
17.
We studied in 130 parturients during childbirth the effects of general anaesthesia by Alfatesine on the state of the foetus at birth. The examinations took into account the APGAR score, blood gas analysis, pH, bases excess in the umbilical artery and vein and the foetal EEG. The subjects are divided into three groups: prophylactic caesarians, extractions during labor in the absence of any foetal distress and extractions for reasons of acute or chronic foetal distress. The results are evaluated in comparison with the same tests conducted on a series of newborn infants in normal conditions and without anaesthesia. The APGAR score is hardly affected by the Alfatesine; the EEG is perturbed (but without any clinical manifestations) during the two hours following delivery. However, theses modifications are less pronounced than those observed with barbiturates. The study of blood gases and pH shows lower values under anaesthesia than without. 相似文献
18.
19.
20.
Cytophotometric, interferometric and autoradiographic methods were applied to evaluate hyperchromic motoneurons (HM) from spinal cord of mice which were allowed to swim for 4 hours. The HM in comparison with the normochromic motor nerve cells are characterized by a higher RNA content and a lower dry weight of perikaria. The autoradiographic data with H3-uridane make it possible to suggest that RNA exchange between the nucleus and cytoplasm of HM is accelerated. The mode of distribution of labelled proteins along the sciatic nerve 6 days after the local injection of H3-leucine in the ventral horn of L3--L4 spinal cord segments allows to conclude that the amount of protein transported with the slow component of axonal flow in the cases connected with the increase of the number of HM in corresponding nuclei is changed. 相似文献