全文获取类型
收费全文 | 62057篇 |
免费 | 2492篇 |
国内免费 | 18篇 |
专业分类
64567篇 |
出版年
2020年 | 582篇 |
2019年 | 782篇 |
2018年 | 1054篇 |
2017年 | 1077篇 |
2016年 | 1149篇 |
2015年 | 852篇 |
2014年 | 992篇 |
2013年 | 4631篇 |
2012年 | 1862篇 |
2011年 | 2018篇 |
2010年 | 1270篇 |
2009年 | 1243篇 |
2008年 | 1792篇 |
2007年 | 1835篇 |
2006年 | 1660篇 |
2005年 | 1462篇 |
2004年 | 1349篇 |
2003年 | 1298篇 |
2002年 | 1412篇 |
2001年 | 2020篇 |
2000年 | 1980篇 |
1999年 | 1518篇 |
1998年 | 733篇 |
1997年 | 653篇 |
1996年 | 658篇 |
1993年 | 581篇 |
1992年 | 1286篇 |
1991年 | 1172篇 |
1990年 | 1163篇 |
1989年 | 1055篇 |
1988年 | 1033篇 |
1987年 | 989篇 |
1986年 | 1068篇 |
1985年 | 1074篇 |
1984年 | 912篇 |
1983年 | 824篇 |
1982年 | 602篇 |
1981年 | 590篇 |
1979年 | 962篇 |
1978年 | 682篇 |
1975年 | 774篇 |
1974年 | 830篇 |
1973年 | 922篇 |
1972年 | 770篇 |
1971年 | 722篇 |
1970年 | 643篇 |
1969年 | 673篇 |
1968年 | 861篇 |
1967年 | 779篇 |
1966年 | 652篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
931.
Varieties of perceptual independence 总被引:6,自引:0,他引:6
932.
933.
934.
935.
936.
937.
Smelling via the mouth: effect of aging 总被引:1,自引:0,他引:1
938.
939.
Tests of psychomotor and motor speed at different levels of complexity were studied in random samples of men aged 31 to 35, 51 to 55, and 71 to 75 yr. The study was performed as a part of a larger research project on health and functional aging. Analyses indicated significantly slower responses among older men at all levels of test complexity (maximal knee extension velocity, tapping rate, simple and choice reaction and movement times). There were marked differences both between the youngest and the middle-aged groups and between the middle-aged and the oldest groups. Within the age groups high psychomotor and motor speed were associated with a favourable functioning of certain senses (vibration sensitivity and postural balance), with a high isometric muscular force, and with a high directly assessed aerobic capacity. The most important covariants of the speed functions within the age groups were, however, cognitive performance, length of education, and perceived health. 相似文献
940.
Taste sensitivity for sodium chloride in solution and sensitivity and preference for sodium chloride in bread were measured in 14 male patients undergoing hemodialysis. There was an increase in sensitivity to salt taste following dialysis only when assessed using the bread samples. Patients on a lower sodium diet were more sensitive to salt taste in bread. Although the taste changes were not related to the decreases in serum sodium or to copper, greater increases in sensitivity were related to greater increases in serum zinc during dialysis. 相似文献