全文获取类型
收费全文 | 52125篇 |
免费 | 2087篇 |
国内免费 | 30篇 |
出版年
2020年 | 585篇 |
2019年 | 740篇 |
2018年 | 1056篇 |
2017年 | 1054篇 |
2016年 | 1113篇 |
2015年 | 741篇 |
2014年 | 910篇 |
2013年 | 4517篇 |
2012年 | 1649篇 |
2011年 | 1800篇 |
2010年 | 1046篇 |
2009年 | 1062篇 |
2008年 | 1631篇 |
2007年 | 1610篇 |
2006年 | 1416篇 |
2005年 | 1286篇 |
2004年 | 1261篇 |
2003年 | 1143篇 |
2002年 | 1182篇 |
2001年 | 1750篇 |
2000年 | 1649篇 |
1999年 | 1265篇 |
1998年 | 664篇 |
1997年 | 572篇 |
1996年 | 516篇 |
1995年 | 521篇 |
1994年 | 498篇 |
1993年 | 519篇 |
1992年 | 1012篇 |
1991年 | 954篇 |
1990年 | 944篇 |
1989年 | 850篇 |
1988年 | 813篇 |
1987年 | 800篇 |
1986年 | 804篇 |
1985年 | 854篇 |
1984年 | 669篇 |
1983年 | 576篇 |
1982年 | 470篇 |
1979年 | 654篇 |
1978年 | 488篇 |
1976年 | 448篇 |
1975年 | 592篇 |
1974年 | 624篇 |
1973年 | 596篇 |
1972年 | 541篇 |
1971年 | 473篇 |
1968年 | 540篇 |
1967年 | 540篇 |
1966年 | 475篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
851.
R F?tzsch R Podemski A Brzecki R Bogdańska 《Psychiatrie, Neurologie, und medizinische Psychologie》1986,38(9):518-525
Twenty six clinically healthy smokers were studied with transient pattern visual-evoked potentials. In comparison with a sample of "normal" subjects we found a difference of some parameters (P less than 0.05): the P2-latency and the interocular difference of latency on average were 6-7 ms respectively 2 ms larger. Thirteen subjects have had a prolonged P2-latency (P less than 0.05) and/or a difference in interocular latencies larger than 5 ms. These findings may suggest on subclinical disturbances of visual system and indicators of an special sensitivity of that person. The findings are possibly related to tobacco-alcohol amblyopia. 相似文献
852.
W Kallenbach G Küllertz G Fischer A Barth 《Psychiatrie, Neurologie, und medizinische Psychologie》1986,38(8):456-463
The dipeptidyl-peptidase activity of 650 liquores cerebrospinalis was obtained by means of the substrate Gly-Pro-NHNp (Gly-Pro-4-nitroanilid) at pHs of 5.5 and 7.4. In comparison with a reference collective, the suitability of the method as a supplementary liquor parameter in neurological psychiatric diagnosis was examined. The introduction of the measurement at pH 7.4 can be particularly recommended for the distinguishing of bacterial and nonbacterial meningitis. 相似文献
853.
Placebo-like effects of education about rational-emotive therapy 总被引:1,自引:0,他引:1
854.
855.
856.
857.
858.
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
859.
For 40 males who smoked 20 cigarettes a day titratable acidity of the urine was significantly correlated with nicotine/cotinine excretion at several sample intervals, as was urinary pH, but not urinary acidity and daily cigarette consumption or serum COHB. 相似文献
860.
6 adult subjects (3 men, 3 women) produced highly similar spontaneous speech utterances in quiet and with 90-dB SPL white noise. The frequency of occurrence of perceptual judgments of primary stressing in an utterance was not affected by the masking noise. This finding supplements our previous report that variability for stress production of fundamental frequency (fo) during spontaneous speech was preserved under short-term auditory disruption. Also, it adds further support to the contention that fo is under open-loop regulation. 相似文献