全文获取类型
收费全文 | 1072733篇 |
免费 | 117420篇 |
国内免费 | 419篇 |
出版年
2018年 | 10167篇 |
2017年 | 9643篇 |
2016年 | 13527篇 |
2015年 | 17865篇 |
2014年 | 21022篇 |
2013年 | 30532篇 |
2012年 | 33939篇 |
2011年 | 34882篇 |
2010年 | 23785篇 |
2009年 | 22128篇 |
2008年 | 31177篇 |
2007年 | 32365篇 |
2006年 | 30218篇 |
2005年 | 29132篇 |
2004年 | 28697篇 |
2003年 | 27732篇 |
2002年 | 27179篇 |
2001年 | 46009篇 |
2000年 | 45589篇 |
1999年 | 36727篇 |
1998年 | 13770篇 |
1997年 | 14153篇 |
1996年 | 13454篇 |
1995年 | 12560篇 |
1994年 | 12183篇 |
1993年 | 12298篇 |
1992年 | 30728篇 |
1991年 | 30162篇 |
1990年 | 29257篇 |
1989年 | 28748篇 |
1988年 | 26323篇 |
1987年 | 25446篇 |
1986年 | 23764篇 |
1985年 | 23771篇 |
1984年 | 19746篇 |
1983年 | 17173篇 |
1982年 | 13123篇 |
1981年 | 11832篇 |
1980年 | 11167篇 |
1979年 | 18647篇 |
1978年 | 14775篇 |
1977年 | 13313篇 |
1976年 | 12779篇 |
1975年 | 14193篇 |
1974年 | 15045篇 |
1973年 | 14933篇 |
1972年 | 13556篇 |
1971年 | 12296篇 |
1970年 | 10574篇 |
1969年 | 10342篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
921.
922.
923.
924.
925.
Biophysics - HMGB1 is one of the key proteins of the cell. HMGB1 performs its main functions predominantly in the cell nucleus, as an essential component of DNA–protein and multiprotein... 相似文献
926.
927.
Dyscalculia, dyslexia, and specific language impairment (SLI) are relatively specific developmental learning disabilities in math, reading, and oral language, respectively, that occur in the context of average intellectual capacity and adequate environmental opportunities. Past research has been dominated by studies focused on single impairments despite the widespread recognition that overlapping and comorbid deficits are common. The present study took an epidemiological approach to study the learning profiles of a large school age sample in language, reading, and math. Both general learning profiles reflecting good or poor performance across measures and specific learning profiles involving either weak language, weak reading, weak math, or weak math and reading were observed. These latter four profiles characterized 70% of children with some evidence of a learning disability. Low scores in phonological short-term memory characterized clusters with a language-based weakness whereas low or variable phonological awareness was associated with the reading (but not language-based) weaknesses. The low math only group did not show these phonological deficits. These findings may suggest different etiologies for language-based deficits in language, reading, and math, reading-related impairments in reading and math, and isolated math disabilities. 相似文献
928.
Biophysics - A technology has been developed for the preparation of novel chloramine compounds related to adenosine derivatives. The optical absorption characteristics of... 相似文献
929.
Biophysics - A change in the content of energy substrates in myocardial mitochondria depending upon the vibration frequency and the duration of the total vertical vibration exposure was studied... 相似文献
930.
Naumova E. V. Vladimirov Yu. A. Beloussov L. V. Tuchin V. V. Volodyaev I. V. 《Biophysics》2021,66(5):764-778
Biophysics - This review is devoted to the methods for studying the ultraweak luminescence of biological objects; in addition to modern methods aimed at studies in the visible, near-infrared, and... 相似文献