全文获取类型
收费全文 | 1417篇 |
免费 | 9篇 |
国内免费 | 1篇 |
专业分类
电工技术 | 5篇 |
化学工业 | 35篇 |
金属工艺 | 20篇 |
机械仪表 | 17篇 |
建筑科学 | 6篇 |
矿业工程 | 3篇 |
能源动力 | 9篇 |
轻工业 | 64篇 |
水利工程 | 2篇 |
石油天然气 | 10篇 |
无线电 | 16篇 |
一般工业技术 | 51篇 |
冶金工业 | 1159篇 |
原子能技术 | 5篇 |
自动化技术 | 25篇 |
出版年
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 6篇 |
2020年 | 5篇 |
2019年 | 5篇 |
2018年 | 12篇 |
2017年 | 7篇 |
2016年 | 10篇 |
2015年 | 2篇 |
2014年 | 12篇 |
2013年 | 34篇 |
2012年 | 16篇 |
2011年 | 17篇 |
2010年 | 12篇 |
2009年 | 8篇 |
2008年 | 14篇 |
2007年 | 5篇 |
2006年 | 5篇 |
2005年 | 7篇 |
2004年 | 4篇 |
2003年 | 7篇 |
2002年 | 5篇 |
1999年 | 30篇 |
1998年 | 377篇 |
1997年 | 171篇 |
1996年 | 132篇 |
1995年 | 71篇 |
1994年 | 51篇 |
1993年 | 71篇 |
1992年 | 11篇 |
1991年 | 21篇 |
1990年 | 10篇 |
1989年 | 11篇 |
1988年 | 14篇 |
1987年 | 12篇 |
1986年 | 14篇 |
1985年 | 16篇 |
1984年 | 2篇 |
1983年 | 5篇 |
1982年 | 7篇 |
1981年 | 7篇 |
1980年 | 13篇 |
1979年 | 3篇 |
1978年 | 8篇 |
1977年 | 50篇 |
1976年 | 103篇 |
1975年 | 6篇 |
1974年 | 2篇 |
1972年 | 2篇 |
1965年 | 2篇 |
排序方式: 共有1427条查询结果,搜索用时 0 毫秒
61.
62.
PL Tecklenberg J Fitzgerald BI Allaire EL Alderman DC Harrison 《Canadian Metallurgical Quarterly》1976,38(7):956-958
The primary goal in the medical management of ventricular septal defect complicating myocardial infarction is to support cardiac function and control symptoms, if possible, for a period of 4 to 6 weeks. If the patient survives this period, surgical correction of the defect is technically easier and safer. In many cases, However, cardiac function is severly compromised, intractable biventricular failure develops,early operation is necessary and the likelihood of successful repair is diminished. 相似文献
63.
EL Lee MJ Robinson ML Thong SD Puthucheary TH Ong KK Ng 《Canadian Metallurgical Quarterly》1977,91(6):991-995
All of 16 infants with neonatal meningitis treated during a 30-month period were found to have accompanying ventriculitis at the time of the initial ventricular puncture. Fifteen of these infants were caused by gramm-negative organisms. All infants received antibiotics systemically and intraventricularly via an implanted ventriculostomy reservoir or by direct ventricular injection. Antibiotic concentrations within the ventricular fluid were monitored during chemotherapy; the complications encountered during treatment are discussed. Fifteen infants survived the infection; of these, seven infants were normal at follow-up examinations. In our experience intraventricular chemotherapy as an adjunct to systemic administration of antibiotics has greatly reduced the mortality rate in neonatal meningitis. 相似文献
64.
BS Reddy A Mastromarino C Gustafson M Lipkin EL Wynder 《Canadian Metallurgical Quarterly》1976,38(4):1694-1698
Fecal neutral steroids and bile acids were measured in patients with familial polyposis, family controls who are immediate relatives of patients, and controls other than relatives. All subjects were consuming a mixed Western diet at the time of collection of stool specimens. Although the total fecal neutral sterol concentrations were not different between the groups, the patients with familial polyposis excreted a high amount of cholesterol and low levels of coprostanol and coprostanone compared with other groups. Patients with familial polyposis excreted levels of total bile acids in their feces comparable to those excreted by controls; lithocholic acid excretion was decreased in patients with familial polyposis. These findings suggest that analysis of stools for cholesterol and its metabolites be useful in screening the siblings of polyposis families for latent disease. 相似文献
65.
Malignant melanoma of the mucous membranes is rare and has a very poor prognosis. When localized in the nose, the tumor becomes apparent late in the course of the disease with nasal obstruction and epistaxis. Distant metastases are uncommon, but any organ of the body can be involved. A case of a malignant melanoma of the nasal mucosa with metastasis to the small intestine is presented, and the natural history of the metastatic disease is discussed. 相似文献
66.
Analysis of measurements from the tali of 21 individual fossil primates from Africa shows that the specimens fall into five clearly defined groups. Accordingly, these specimens have been included as groups along with extant species in a subsequent canonical analysis thus allowing the fossils to play their part in the determination of the canonical separations. The results of this procedure show that the five fossil groups lie in a part of the canonical space not occupied by any extant African primate. Their positions are between the envelope of Asiatic apes (Hylobates and Pongo) and the envelope of African forms near the edge which contains Pan and Papio. One fossil group is so similar to Hylobates that its talus may have functioned in locomotion in a parallel manner. Others lie near to Pongo in directions proceeding towards Pan and Papio and it is possible that this similarity may indicate remnants of morphological adaptation for climbing in these fossils. At the same time, however, individual specimens are closer to one or another of the extant groups and this considerable spread suggests that the locomotor adaptations as evidenced by talar morphology, of the primate fauna in Africa, may have been very different from those of the present day. This would not the inconsistent with the different habitats, floras and non-primate faunas that may have characterized the East African scene at these earlier times. Particular fossils from Olduvai and Kromdraai that are supposed to be australopithecine and therefore bipeds, are confirmed (Oxnard, '72; Lisowski et al., '74) as being totally different from man in their talar morphology and essentially rather similar to the majority of the other fossil tali examined. 相似文献
67.
68.
69.
Recently promulgated federal regulations mandate the provision of an emergency, self-contained, oxygen-supplying breathing device (self-contained self-rescuer, SCSR) to all underground coalminers. In order to assist in defining the potential limitations of this new device, we measured the responses of ten healthy coal mine inspectors to submaximal steady-state treadmill exercise with and without the SCSR. During the last minute of exercise, blood oxygen saturation averaged 98.3% and mouth pressure swing 15.6 cm H2O with the device, compared to 94.8% and 10.4 cm H2O without it. Mean respiratory rates were decreased to 25/min with the SCSR from 28/min without it. Blood pressure, core temperature and heart rate were unaffected. We conclude that in healthy individuals on submaximal exercise there is little evidence of a significant adverse effect of the new device. 相似文献
70.