全文获取类型
收费全文 | 1487篇 |
免费 | 75篇 |
专业分类
各国政治 | 94篇 |
工人农民 | 68篇 |
世界政治 | 114篇 |
外交国际关系 | 114篇 |
法律 | 819篇 |
中国政治 | 12篇 |
政治理论 | 331篇 |
综合类 | 10篇 |
出版年
2023年 | 22篇 |
2022年 | 26篇 |
2021年 | 17篇 |
2020年 | 41篇 |
2019年 | 60篇 |
2018年 | 51篇 |
2017年 | 78篇 |
2016年 | 81篇 |
2015年 | 50篇 |
2014年 | 71篇 |
2013年 | 217篇 |
2012年 | 68篇 |
2011年 | 48篇 |
2010年 | 49篇 |
2009年 | 46篇 |
2008年 | 56篇 |
2007年 | 74篇 |
2006年 | 58篇 |
2005年 | 61篇 |
2004年 | 43篇 |
2003年 | 41篇 |
2002年 | 49篇 |
2001年 | 24篇 |
2000年 | 22篇 |
1999年 | 26篇 |
1998年 | 14篇 |
1997年 | 14篇 |
1996年 | 9篇 |
1995年 | 15篇 |
1994年 | 10篇 |
1993年 | 3篇 |
1992年 | 22篇 |
1991年 | 7篇 |
1990年 | 6篇 |
1989年 | 11篇 |
1988年 | 8篇 |
1987年 | 6篇 |
1986年 | 7篇 |
1985年 | 7篇 |
1984年 | 3篇 |
1983年 | 7篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1975年 | 3篇 |
1973年 | 3篇 |
1969年 | 4篇 |
1966年 | 3篇 |
1962年 | 1篇 |
1955年 | 1篇 |
排序方式: 共有1562条查询结果,搜索用时 0 毫秒
71.
72.
Miguel Gouveia 《Public Choice》1997,93(3-4):221-244
This paper extends the literature on the socialization of commodities by developing a model of voting over the public provision of a private good: health care. The private use of health care is modeled as a supplement rather than as an exclusive alternative to public health care. A majority rule equilibrium is shown to exist. The equilibrium characterization is an example of Director's Law of Income Redistribution. A ban on private health care activities is shown to be opposed by a majority of voters. Implications for the size and distribution of private health care expenditures are drawn. 相似文献
73.
Using a behavioral model of political decisionmaking, it is argued that an increasing population size and/or an increasing efficiency of production in a private enterprise economy relative to a centrally planned economy may create the conditions for a self-interested nomenklatura in a Soviet-type economy to consider a transition to a market economy. This transition may be thwarted, however, by the threat for prospective private enterpreneurs of exploitation after the change of regime. Some form of political pluralism guaranteeing sufficient political influence to private entrepreneurs appears to be required for a successful transition. The analysis shows that such a combined political and economic reform can be in the interest of the nomenklatura, thereby providing an endogenous behavioral explanation for a change of regime. 相似文献
74.
Corte-Real F Andrade L Anjos MJ Carvalho M Vieira DN Carracedo A Vide MC 《Journal of forensic sciences》2000,45(2):432-435
The Short Tandem Repeats (STRs) D3S1358, HUMvWA31/A, HUMFIBRA/FGA, D8S 1179, D2S11, D18S51, D5S818, D13S317, and D7S820 were studied in two Brazilian populations (from Amazonia and S. Paulo) using the "AmpF1 STR Profiler Plus PCR Amplification Kit." The nine loci showed a combined discrimination power greater than 0.9999999999 and a chance of exclusion of 0.9999. 相似文献
75.
76.
Bermejo Barrera P Lorenzo Alonso MJ Bermejo Barrera A Cocho de Juan JA Fraga Bermúdez JM 《Forensic science international》2000,107(1-3):149-156
A method for the selenium determination in a mother and her child's hair using palladium as a chemical modifier was optimized. The sample was digested with nitric acid and hydrogen peroxide and diluted to 5 ml. To achieve complete mineralization the samples were ashed at 1200 degrees C in the presence of palladium as a chemical modifier. The optimum atomization temperature was 1900 degrees C. The precision and accuracy of the method were studied using the reference material CRM 397. Results of calibration using aqueous standards and the standard addition method were compared. The method was applied to the selenium determination in 30 samples of the mother's and child's hair. The levels found were 0.54 +/- 0.34 microgram/g for mother's hair and 0.77 +/- 0.25 microgram/g for child's hair. 相似文献
77.
78.
Sípoli Marques MA Pinto Damasceno LM Gualberto Pereira HM Caldeira CM Pereira Dias BF de Giacomo Vargens D Amoedo ND Volkweis RO Volkweis Viana RO Rumjanek FD Aquino Neto FR 《Journal of forensic sciences》2005,50(3):587-592
A clear positive case for anabolic steroids doping was confounded by alleged urine tampering during doping control procedures. Review of the chain of custody showed no flaws, but nevertheless the athlete was adamant that the urine sample should be analyzed for DNA in order to support her contention that she was not the donor of the sample. The results obtained showed that the urine sample that scored positive for steroids contained nuclear DNA that could not be matched to the DNA obtained from the athlete's blood. On the other hand, the same urine sample contained mitochondrial DNA whose nucleotide sequences spanning the hyper variable regions HV1 and HV2 proved to be identical to those determined in mitochondrial DNA amplified from the athlete's blood. The occurrence of an extraneous genotype is compatible with exogenous nuclear DNA admixture to the athlete's urine. Alternatively, taking in consideration the mitochondrial DNA, we could not exclude that a sibling or a maternal relative of the athlete could have acted as a donor of the urine utilized for doping control and DNA analysis. Both situations point to possible tampering of the urine by the athlete. Adjudication at CAS maintained previous national and international federation decision that there was no proof of a chain of custody flaw to justify the athlete's allegation of urine substitution after collection. 相似文献
79.
80.