全文获取类型
收费全文 | 3458篇 |
免费 | 1篇 |
专业分类
电工技术 | 1篇 |
化学工业 | 5篇 |
机械仪表 | 1篇 |
轻工业 | 6篇 |
石油天然气 | 1篇 |
无线电 | 5篇 |
一般工业技术 | 5篇 |
冶金工业 | 3434篇 |
自动化技术 | 1篇 |
出版年
2019年 | 1篇 |
2017年 | 1篇 |
2013年 | 1篇 |
2011年 | 1篇 |
2010年 | 1篇 |
2008年 | 1篇 |
2004年 | 1篇 |
2003年 | 4篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 99篇 |
1998年 | 939篇 |
1997年 | 573篇 |
1996年 | 357篇 |
1995年 | 201篇 |
1994年 | 190篇 |
1993年 | 210篇 |
1992年 | 31篇 |
1991年 | 50篇 |
1990年 | 52篇 |
1989年 | 63篇 |
1988年 | 61篇 |
1987年 | 62篇 |
1986年 | 55篇 |
1985年 | 53篇 |
1983年 | 10篇 |
1982年 | 20篇 |
1981年 | 24篇 |
1980年 | 36篇 |
1979年 | 3篇 |
1978年 | 13篇 |
1977年 | 105篇 |
1976年 | 225篇 |
1975年 | 10篇 |
1955年 | 3篇 |
排序方式: 共有3459条查询结果,搜索用时 0 毫秒
121.
122.
123.
Cluster analysis was used to identify two homogeneous clusters of 8-9 1/2-year-old children who misarticulated /s/, /r/, or both. The analysis was based on the children's scores on 40 measures of language, reading, auditory processing, and other variables. Discriminant function analysis was then used to identify a subset of five measures and a means of computing classification scores. These measures and the classification scores can be used to identify the cluster membership of new subjects. The use of classification scores for identifying cluster membership was cross-validated against cluster analysis of a second group of children. The two clusters are described in terms of their performance on language and reading measures. 相似文献
124.
125.
126.
127.
128.
In the experiment reported in this paper, 22 of 35 neurons in the gustatory NTS were found to respond to odorant as well as taste stimuli. This odorant response was apparently mediated by the ethmoid nerve and at least one other odorant-responsive system, possibly other nasal trigeminal afferents. These gustatory neurons responded to odorants, as they did to taste stimuli, in a manner consistent with an encoding of stimulus quality information. Thus at least some of the neurons of the gustatory NTS carry information concerning several of the senses involved in ingestion. 相似文献
129.
PJ Hofschire EP Todd RL Varco EL Kaplan JE Edwards 《Canadian Metallurgical Quarterly》1976,69(3):439-440
We report an unusual case in which an apparently normal upper lobe of the right lung was supplied by major systemic arterial and pulmonary arterial vessels. The anomalous artery arose from the descending aorta. Following interruption of this vessel, the machinery-like murmur previously present disappeared. 相似文献
130.