全文获取类型
收费全文 | 3429篇 |
免费 | 4篇 |
专业分类
综合类 | 2篇 |
化学工业 | 35篇 |
机械仪表 | 1篇 |
建筑科学 | 16篇 |
矿业工程 | 1篇 |
能源动力 | 2篇 |
轻工业 | 12篇 |
无线电 | 1篇 |
一般工业技术 | 10篇 |
冶金工业 | 3344篇 |
自动化技术 | 9篇 |
出版年
2023年 | 1篇 |
2021年 | 1篇 |
2020年 | 2篇 |
2019年 | 1篇 |
2018年 | 2篇 |
2017年 | 5篇 |
2016年 | 1篇 |
2015年 | 2篇 |
2014年 | 3篇 |
2013年 | 7篇 |
2011年 | 2篇 |
2010年 | 2篇 |
2009年 | 2篇 |
2008年 | 1篇 |
2007年 | 1篇 |
2006年 | 5篇 |
2005年 | 7篇 |
2004年 | 4篇 |
2003年 | 9篇 |
2002年 | 4篇 |
2000年 | 1篇 |
1999年 | 103篇 |
1998年 | 993篇 |
1997年 | 596篇 |
1996年 | 373篇 |
1995年 | 240篇 |
1994年 | 174篇 |
1993年 | 211篇 |
1992年 | 32篇 |
1991年 | 63篇 |
1990年 | 51篇 |
1989年 | 64篇 |
1988年 | 59篇 |
1987年 | 44篇 |
1986年 | 34篇 |
1985年 | 34篇 |
1983年 | 7篇 |
1982年 | 20篇 |
1981年 | 15篇 |
1980年 | 19篇 |
1979年 | 2篇 |
1978年 | 5篇 |
1977年 | 94篇 |
1976年 | 129篇 |
1975年 | 5篇 |
1974年 | 1篇 |
1968年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有3433条查询结果,搜索用时 19 毫秒
991.
992.
993.
994.
995.
Senior staff of the departments of medicine, surgery and general practice in each medical school in the United Kingdom were asked to annotate the same case studies which had been prepared by medical students. Analysis of the annotations showed that general practitioners demanded much greater consideration by the student of the patient, his family and his environment, whereas physicians and surgeons tended to be more disease orientated. Nevertheless, expectations and attitudes of teachers in similar departments are remarkably diverse and this highlighted the potential role of the case study as an educational tool for staff and students alike. Many departments need to clarify the difference between undergraduate and postgraduate teaching objectives. 相似文献
996.
From 1957 to 1975, 43 women with gynecologic malignancies had associated enterocutaneous or enterovaginal fistula. Thirty-four of these women underwent surgical correction of the fistula. The etiology, diagnostic evaluation, preoperative complications, and surgical correction of such fistulae are discussed. In addition, a staged planned management of these fistulae is outlined. 相似文献
997.
An analysis of 69 cases of bifascicular and trifascicular types of intraventricular conduction disturbances in myocardial infarction is presented. Complications, caused of death and the follow-up of unpaced cases for a year have been recorded. Pump failure and severe degrees of blocks with consequent ventricular asystole are the important caused of death. Recurrent pump failure with occasional outcome is more common in cases with RBBB and LAH than in other types of blocks. 相似文献
998.
This paper describes methadone blockade treatment of 50 opiate addicts. At follow-up, 36 patients were traced and interviewed. Results show that 89% of the 36 patients cooperated with the treatment programme, 88% had no new criminal convictions and 75% remained drug-free, apart from taking methadone during the follow-up period (mean, 12-5 months). Five of the 36 patients were free of all drug addictions, including methadone. 相似文献
999.
1000.