全文获取类型
收费全文 | 40433篇 |
免费 | 1953篇 |
国内免费 | 36篇 |
专业分类
电工技术 | 275篇 |
综合类 | 29篇 |
化学工业 | 7282篇 |
金属工艺 | 719篇 |
机械仪表 | 761篇 |
建筑科学 | 1246篇 |
矿业工程 | 73篇 |
能源动力 | 781篇 |
轻工业 | 5304篇 |
水利工程 | 368篇 |
石油天然气 | 169篇 |
武器工业 | 4篇 |
无线电 | 2264篇 |
一般工业技术 | 7110篇 |
冶金工业 | 10416篇 |
原子能技术 | 193篇 |
自动化技术 | 5428篇 |
出版年
2023年 | 347篇 |
2022年 | 326篇 |
2021年 | 870篇 |
2020年 | 730篇 |
2019年 | 666篇 |
2018年 | 1494篇 |
2017年 | 1493篇 |
2016年 | 1541篇 |
2015年 | 1094篇 |
2014年 | 1388篇 |
2013年 | 2706篇 |
2012年 | 2348篇 |
2011年 | 2164篇 |
2010年 | 1708篇 |
2009年 | 1515篇 |
2008年 | 1779篇 |
2007年 | 1545篇 |
2006年 | 1156篇 |
2005年 | 960篇 |
2004年 | 904篇 |
2003年 | 799篇 |
2002年 | 713篇 |
2001年 | 456篇 |
2000年 | 457篇 |
1999年 | 608篇 |
1998年 | 3344篇 |
1997年 | 1998篇 |
1996年 | 1294篇 |
1995年 | 753篇 |
1994年 | 647篇 |
1993年 | 633篇 |
1992年 | 207篇 |
1991年 | 222篇 |
1990年 | 219篇 |
1989年 | 212篇 |
1988年 | 189篇 |
1987年 | 166篇 |
1986年 | 179篇 |
1985年 | 210篇 |
1984年 | 182篇 |
1983年 | 130篇 |
1982年 | 160篇 |
1981年 | 171篇 |
1980年 | 153篇 |
1979年 | 126篇 |
1978年 | 118篇 |
1977年 | 197篇 |
1976年 | 416篇 |
1975年 | 88篇 |
1973年 | 81篇 |
排序方式: 共有10000条查询结果,搜索用时 12 毫秒
51.
52.
53.
54.
We compared the performance of patients with frontal excisions, patients with temporal excisions and controls in tasks involving speeded choice responses in which a number of variables were manipulated including: perceptual difficulty, stimulus and response set-size, associative complexity, and spatial stimulus-response compatibility. Response times were sensitive to all manipulations but did not show any group differences. The error rates of the three groups were equally affected by perceptual difficulty and response set-size but frontals were preferentially affected by spatial S-R compatibility, associative complexity, and the number of stimuli per response. The results are consistent with a basic deficit in response selection processes which could underly many problems produced by frontal lesions. 相似文献
55.
56.
57.
Software Quality Journal - Energy consumption of software has been becoming increasingly significant, since it can vary according to how the software has been developed. In recent years, developers... 相似文献
58.
C García Barroso R Cela Torrijos J A Pérez-Bustamante 《Zeitschrift für Lebensmittel-Untersuchung und -Forschung》1987,185(4):307-314
The different groups and/or classes among phenolic acids and aldehydes identified during the elaboration process of "fino" sherry wine have been studied. The study was carried out using different processes during the elaboration of the wine and we have attempted to establish whether the different treatments of the grape affect these groupings. The study was undertaken by means of cluster and multifactorial analysis on the data obtained by the quantitative determination of phenolic acids and aldehydes during vinification and in experiments carried out on the grape under different mechanical treatments. The analysis of phenolic acids and aldehydes was done with HPLC, using a C-18 mu-Bondapak and a stepwise composite gradient. The samples were previously extracted with ethylic ether. 相似文献
59.
Tin electrodeposition in its initial stages in acid sulfate/gluconate baths was studied with varying tin and gluconate concentrations using potential-controlled electrochemical techniques. The deposit morphology was observed by scanning electron microscopy (SEM). A comparison with tin electrodeposition from acid sulfate baths in the absence of gluconate was also carried out. Use of a highly acidic bath leads to nonuniform deposits, even in the presence of gluconate; at pH 4 deposits are uniform, brilliant and suitable for finishing applications. Tin crystallites have a well defined morphology which depends on bath agitation conditions. In the absence of agitation, the crystallites have the same tetragonal shape as in a sulfate bath without gluconate. 相似文献
60.
V. M. Lupéiko P. V. Umrikhin P. N. Dé'yachkov V. A. Perepelitsyn 《Refractories and Industrial Ceramics》1967,8(1-2):125-128
Conclusions A laboratory installation for flame guncreting was designed, built, and tested. A method was developed for flame guncreting of basic refractories. The guncreted layer obtained as a result of flame guncreting is formally bonded with the refractory, and in its density and structure, is significantly better than it.Translated from Ogneupory, No.2, pp.54–57, February, 1967. 相似文献