全文获取类型
收费全文 | 1278102篇 |
免费 | 136813篇 |
国内免费 | 1066篇 |
专业分类
1415981篇 |
出版年
2018年 | 12095篇 |
2017年 | 11456篇 |
2016年 | 16449篇 |
2015年 | 21881篇 |
2014年 | 25829篇 |
2013年 | 37239篇 |
2012年 | 41248篇 |
2011年 | 42133篇 |
2010年 | 28639篇 |
2009年 | 26293篇 |
2008年 | 37111篇 |
2007年 | 38141篇 |
2006年 | 36048篇 |
2005年 | 34738篇 |
2004年 | 34212篇 |
2003年 | 32887篇 |
2002年 | 31984篇 |
2001年 | 58043篇 |
2000年 | 58292篇 |
1999年 | 46128篇 |
1998年 | 16282篇 |
1997年 | 16988篇 |
1996年 | 15896篇 |
1995年 | 14863篇 |
1994年 | 14404篇 |
1993年 | 14229篇 |
1992年 | 37926篇 |
1991年 | 36861篇 |
1990年 | 35997篇 |
1989年 | 35133篇 |
1988年 | 32594篇 |
1987年 | 30714篇 |
1986年 | 28485篇 |
1985年 | 28536篇 |
1984年 | 23744篇 |
1983年 | 19977篇 |
1982年 | 15110篇 |
1981年 | 13694篇 |
1980年 | 12844篇 |
1979年 | 21885篇 |
1978年 | 17034篇 |
1977年 | 15557篇 |
1976年 | 14305篇 |
1975年 | 15921篇 |
1974年 | 17071篇 |
1973年 | 16935篇 |
1972年 | 15216篇 |
1971年 | 13975篇 |
1970年 | 12122篇 |
1969年 | 11506篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
101.
M R Chandler 《Perspectives in biology and medicine》1991,35(1):105-115
Over the past 10 years the AIDS crisis has produced a large volume of writing. Much of this is documentary. Dozens of studies of AIDS from various clinical and political perspectives have been complemented by just as many published diaries, autobiographies, novels, plays, and poems. A few of these works have risen to the surface not only as extraordinarily valuable testimonies to the changes AIDS has wrought in individual and collective life but also as first-rate literary works, worth reading because beyond their immediate purposes they articulate with extraordinary lucidity and compassion some deep truths about the human--and the modern--condition. Paul Monette's Borrowed Time is among the most distinctive of those. It speaks not only for the community of people with AIDS and those who support them but for a generation. 相似文献
102.
103.
Trigger finger is a relatively common clinical entity, most frequently caused by stenosing tenosynovitis. Several other conditions not related to tenosynovitis also have been described as a cause of triggering, and these have been reviewed. We present a rare anomaly of the fourth lumbrical muscle insertion as a cause of triggering of the right little finger. This was completely relieved following excision of the anomalous muscle. This rare anatomic variant should be added to the list of potential causes of trigger finger. 相似文献
104.
105.
106.
107.
Besides vobtusine and vobtusine-lactone, deoxyvobtusine was isolated from the leaves of Voacanga grandifolia (Miq. Rolfe. Spectral and chemical evi 相似文献
108.
109.
110.