全文获取类型
收费全文 | 2043篇 |
免费 | 1篇 |
专业分类
化学工业 | 5篇 |
机械仪表 | 1篇 |
轻工业 | 3篇 |
石油天然气 | 2篇 |
无线电 | 4篇 |
冶金工业 | 2024篇 |
自动化技术 | 5篇 |
出版年
2022年 | 1篇 |
2015年 | 2篇 |
2013年 | 2篇 |
2011年 | 2篇 |
2010年 | 1篇 |
2007年 | 2篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2003年 | 3篇 |
2000年 | 1篇 |
1999年 | 82篇 |
1998年 | 654篇 |
1997年 | 351篇 |
1996年 | 227篇 |
1995年 | 141篇 |
1994年 | 114篇 |
1993年 | 109篇 |
1992年 | 15篇 |
1991年 | 14篇 |
1990年 | 13篇 |
1989年 | 22篇 |
1988年 | 21篇 |
1987年 | 24篇 |
1986年 | 19篇 |
1985年 | 19篇 |
1983年 | 4篇 |
1982年 | 8篇 |
1981年 | 14篇 |
1980年 | 13篇 |
1979年 | 1篇 |
1978年 | 4篇 |
1977年 | 61篇 |
1976年 | 91篇 |
1975年 | 3篇 |
1964年 | 1篇 |
排序方式: 共有2044条查询结果,搜索用时 15 毫秒
1.
2.
EJ Amella 《Canadian Metallurgical Quarterly》1998,19(5):269-74; quiz 275
Adequate nutritional intake is critical to preserving the health of older people. When an elderly person requires assistance with eating, the most social of all activities of daily living, the assessment of nutritional issues becomes multidimensional and interdisciplinary. Management strategies should involve the professional nurse's attention to dietary needs, as well as the social, cultural, and interactive components of mealtime. Additionally, special strategies need to be developed for people with cognitive and physical disabilities. 相似文献
3.
4.
5.
6.
This study examined the effects of instructional match and content overlap on students' ability to generalize from passage reading instruction. Four students with mild disabilities served as participants. Using a multielement design, students were instructed with passages at two levels of text difficulty (instructionally matched vs. instructionally mismatched), and generalization was assessed with passages at two levels of similarity to those instructed (low vs. high content overlap). Results indicated that students' oral reading accuracy and fluency showed the greatest degree of generalization when instructional materials were matched to the students' skill level and assessment materials were similar to those used during instruction. Moreover, these results were maintained at 1-month follow-up. The implications of these findings for classroom reading instruction and the assessment of students' reading skills are discussed. 相似文献
7.
8.
Pancreatic cancer is a dismal disease. The 5-year overall survival ranges from 1% to 5%. Surgery is the only curative treatment available for this cancer, but it is indicated only in selected patients with a less than 4 cm tumor. In these patients, survival rate is about 30%. We have considered several aspects: the very difficult early diagnosis, the correct diagnostic flow chart, actual surgical procedures and new trends in biologic and genetic research. It is likely that better results can be achieved by defining an "early pancreatic cancer" and establishing how to detect it. This could be the wrigth one way is to significantly improve the survival of these patients. 相似文献
9.
EJ Topol 《Canadian Metallurgical Quarterly》1998,352(9131):897-898
10.
Lymphocyte sensitization to measles has been studied in comparable groups of multiple sclerosis, other neurologic disease and normal subjects. The macrophage electrophoretic mobility test has been used. No difference between the three groups has been found, though there is a small group of children with obscure neurological disease which might well be multiple sclerosis and which fails to mount an adequate response to measles. The role of measles (and other banal infections) in aetiopathogenesis of multiple sclerosis is briefly discussed. 相似文献